<SEC-DOCUMENT>0001047469-17-007570.txt : 20171208
<SEC-HEADER>0001047469-17-007570.hdr.sgml : 20171208
<ACCEPTANCE-DATETIME>20171208170446
ACCESSION NUMBER:		0001047469-17-007570
CONFORMED SUBMISSION TYPE:	S-3
PUBLIC DOCUMENT COUNT:		4
FILED AS OF DATE:		20171208
DATE AS OF CHANGE:		20171208

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			LEAP THERAPEUTICS, INC.
		CENTRAL INDEX KEY:			0001509745
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				274412575
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		S-3
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	333-221968
		FILM NUMBER:		171247724

	BUSINESS ADDRESS:	
		STREET 1:		47 THORNDIKE STREET
		STREET 2:		SUITE B1-1
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142
		BUSINESS PHONE:		617 252 4343

	MAIL ADDRESS:	
		STREET 1:		47 THORNDIKE STREET
		STREET 2:		SUITE B1-1
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02142

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Dekkun Corp
		DATE OF NAME CHANGE:	20110107
</SEC-HEADER>
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</FONT> <FONT SIZE=2><A HREF="#bg17801a_main_toc">Table of Contents</A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B>As filed with the Securities and Exchange Commission on December&nbsp;8, 2017.  </B></FONT></P>

<P ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=1><B> Registration No.&nbsp;333-&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</B></FONT></P>

<P style="font-family:times;"><FONT SIZE=1><B><BR>  </B></FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=5><B>UNITED STATES SECURITIES AND EXCHANGE COMMISSION<BR>  </B></FONT><FONT SIZE=1><B>WASHINGTON, DC 20549  </B></FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=5><B>FORM S-3<BR>  </B></FONT><FONT SIZE=1><B>REGISTRATION STATEMENT<BR>
UNDER<BR>
THE SECURITIES ACT OF&nbsp;1933  </B></FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=5><B>LEAP THERAPEUTICS,&nbsp;INC.<BR>  </B></FONT><FONT SIZE=1>(Exact name of registrant as specified in its charter) </FONT></P>

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<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B>Delaware</B></FONT><FONT SIZE=1><BR>
(State or other jurisdiction of<BR>
incorporation or organization)</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B> 27-4412575</B></FONT><FONT SIZE=1><BR>
(IRS Employer<BR>
Identification Number)</FONT></TD>
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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B>47 Thorndike Street<BR>
Suite B1-1<BR>
Cambridge, MA 02141<BR>
Telephone: (617)&nbsp;714-0360</B></FONT><FONT SIZE=1><BR>
(Address, including zip code, and telephone number, including area code, of registrant's principal executive offices) </FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B>Christopher K. Mirabelli, Ph.D.<BR>
Chairman, President and Chief Executive Officer<BR>
Leap Therapeutics,&nbsp;Inc.<BR>
47 Thorndike Street, Suite B1-1<BR>
Cambridge, MA 02141<BR>
(617)&nbsp;714-0360</B></FONT><FONT SIZE=1><BR>
(Name, address, including zip code, and telephone number, including area code, of agent for service) </FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B>Copy to:<BR>
Julio E. Vega, Esq.<BR>
Morgan, Lewis&nbsp;&amp; Bockius&nbsp;LLP<BR>
One Federal Street<BR>
Boston, Massachusetts 02110<BR>
(617)&nbsp;951-8000</B></FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B>Approximate date of commencement of proposed sale to the public:<BR>
From time to time after the effective date of this Registration Statement.  </B></FONT></P>


<P style="font-family:times;"><FONT SIZE=1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following
box.&nbsp;&nbsp;&nbsp;&nbsp;<FONT FACE="WINGDINGS">&#111;</FONT> </FONT></P>

<P style="font-family:times;"><FONT SIZE=1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule&nbsp;415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box.&nbsp;&nbsp;&nbsp;&nbsp;<FONT FACE="WINGDINGS">&#253;</FONT> </FONT></P>


<P style="font-family:times;"><FONT SIZE=1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If this Form is filed to register additional securities for an offering pursuant to Rule&nbsp;462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier effective registration statement for the same offering.&nbsp;&nbsp;&nbsp;&nbsp;<FONT FACE="WINGDINGS">&#111;</FONT> </FONT></P>

<P style="font-family:times;"><FONT SIZE=1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If this Form is a post-effective amendment filed pursuant to Rule&nbsp;462(c) under the Securities Act, please check the following box and list the Securities
Act registration statement number of the earlier effective registration statement for the same offering.&nbsp;&nbsp;&nbsp;&nbsp;<FONT FACE="WINGDINGS">&#111;</FONT> </FONT></P>


<P style="font-family:times;"><FONT SIZE=1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If this Form is a registration statement pursuant to General Instruction&nbsp;I.D. or a post-effective amendment thereto that shall become effective upon filing
with the Commission pursuant to Rule&nbsp;462(e) under the Securities Act, check the following box.&nbsp;&nbsp;&nbsp;&nbsp;<FONT FACE="WINGDINGS">&#111;</FONT> </FONT></P>

<P style="font-family:times;"><FONT SIZE=1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction&nbsp;I.D. filed to register additional securities
or additional classes of securities pursuant to Rule&nbsp;413(b) under the Securities Act, check the following box.&nbsp;&nbsp;&nbsp;&nbsp;<FONT FACE="WINGDINGS">&#111;</FONT> </FONT></P>


<P style="font-family:times;"><FONT SIZE=1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an
emerging growth company. See the definitions of "large accelerated filer," "accelerated filer", "smaller reporting company"and "emerging growth company" in Rule&nbsp;12b-2 of the Securities Exchange
Act of 1934. </FONT></P>
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<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1>Large accelerated filer <FONT FACE="WINGDINGS">&#111;</FONT></FONT></TD>
<TD style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1>Accelerated filer <FONT FACE="WINGDINGS">&#111;</FONT></FONT></TD>
<TD style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1>Non-accelerated filer <FONT FACE="WINGDINGS">&#111;</FONT><BR></FONT> <FONT SIZE=1>(Do not check if a<BR>
smaller reporting company)</FONT></TD>
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 Smaller reporting company <FONT FACE="WINGDINGS">&#253;</FONT></font> <p align=center style="font-family:times;margin-top:0pt;margin-left:0pt;"> <FONT SIZE=1> Emerging growth company <FONT FACE="WINGDINGS">&#253;</FONT></FONT></TD>
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 <P style="font-family:times;"><FONT SIZE=1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;If
an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting
standards provided pursuant to Section&nbsp;7(a)(2)(B) of Securities Act.&nbsp;<FONT FACE="WINGDINGS">&#111;</FONT> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B>CALCULATION OF REGISTRATION FEE  </B></FONT></P>
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<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TD>
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<TH ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B>Title of Each Class of Securities<BR>
to be Registered(1)</B></FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B>Amount to be<BR>
Registered(1)(2)</B></FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B>Proposed Maximum<BR>
Offering Price Per<BR>
Share(3)</B></FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B>Proposed Maximum<BR>
Aggregate Offering<BR>
Price</B></FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1><B>Amount of<BR>
Registration Fee</B></FONT><BR></TH>
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<TD style="font-family:times;"><p style="font-family:times;margin-left:3pt;text-indent:-3pt;"><FONT SIZE=1><B> </B></FONT><FONT SIZE=1>Common Stock, par value $0.001 per share</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1>1,867,457</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1>$6.56</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1>$12,250,517.92</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1>$1,525.19</FONT></TD>
</TR>
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<TD COLSPAN=9 VALIGN="BOTTOM" style="font-family:times;border-bottom:solid #000000 1.0pt;">&nbsp;</TD>
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<TD style="font-family:times;"><p style="font-family:times;margin-left:3pt;text-indent:-3pt;"><FONT SIZE=1> </FONT><FONT SIZE=1>Common Stock, par value $0.001 per share, underlying warrants</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1>1,867,457</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1>$6.56</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1>$12,250,517.92</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1>$1,525.19</FONT></TD>
</TR>
<TR style="font-size:1.5pt;" VALIGN="TOP">
<TD COLSPAN=9 VALIGN="BOTTOM" style="font-family:times;border-bottom:solid #000000 1.0pt;">&nbsp;</TD>
</TR>
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<TD style="font-family:times;"><p style="font-family:times;margin-left:3pt;text-indent:-3pt;"><FONT SIZE=1> </FONT><FONT SIZE=1>Total</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1>3,734,914</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1>$24,501,035.84</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=1>$3,050.38</FONT></TD>
</TR>
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<DT style='font-family:times;margin-bottom:-9pt;'><FONT SIZE=1>(1)</FONT></DT><DD style="font-family:times;"><FONT SIZE=1>The
shares being registered hereunder consist of 1,867,457 shares of common stock and 1,867,457 shares of common stock that may be acquired upon exercise of
warrants, in each case which shares of common stock may be sold from time to time by the selling stockholders.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-9pt;'><FONT SIZE=1>(2)</FONT></DT><DD style="font-family:times;"><FONT SIZE=1>Pursuant
to Rule&nbsp;416 under the Securities Act of 1933, as amended (the "Securities Act"), this registration statement also covers any indeterminate number of
additional shares of common stock issuable upon stock splits, stock dividends, dividends or other distributions, recapitalizations or similar events with respect to the shares of common stock being
registered pursuant to this registration statement.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-9pt;'><FONT SIZE=1>(3)</FONT></DT><DD style="font-family:times;"><FONT SIZE=1>Estimated
solely for the purposes of calculating the registration fee pursuant to Rule&nbsp;457(c) under the Securities Act of 1933 based on the average of the
high and low per share prices of the registrant's common stock as reported on The Nasdaq Global Market on December&nbsp;6, 2017.  </FONT></DD></DL>
 </DIV>
 <P style="font-family:times;"><FONT SIZE=1>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT
SIZE=1><B>The Registrant hereby amends this Registration Statement on such date or dates as may be necessary to delay its effective date until the Registrant shall
file&nbsp;a further amendment which specifically states that this Registration Statement shall thereafter become effective in accordance with Section&nbsp;8(a) of the Securities Act of 1933 or
until this Registration Statement shall become effective on such date as the Securities and Exchange Commission, acting pursuant to such Section&nbsp;8(a), may determine.</B></FONT></P>


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</FONT> <FONT SIZE=2><A HREF="#bg17801a_main_toc">Table of Contents</A> </FONT></P>

<P style="font-family:times;"><FONT COLOR="#FF4040" SIZE=2><B>The information contained in this prospectus is not complete and may be changed. The selling stockholders named in this prospectus may not sell these
securities until the Registration Statement filed with the Securities and Exchange Commission is effective. This prospectus is not an offer to sell these securities and is not a solicitation of offers
to buy these securities in any jurisdiction where such offer or sale is not permitted.</B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT COLOR="#FF4040" SIZE=2><B>Subject to Completion, dated December&nbsp;8, 2017</B></FONT></P>


<P style="font-family:times;"><FONT SIZE=2><B> Prospectus  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B>
<IMG SRC="g530771.jpg" ALT="LOGO" WIDTH="322" HEIGHT="96">
  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=5><B>Leap Therapeutics,&nbsp;Inc.<BR>  </B></FONT><FONT SIZE=4><B>3,734,914 Shares<BR>
Common Stock  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This prospectus relates to the possible resale by the selling stockholders (the "Selling Stockholders") identified in this prospectus of up to
3,734,914 shares of our common stock, par value $0.001 per share (the "Common Stock"), which includes (i)&nbsp;1,867,457 shares of our Common Stock issued on November&nbsp;14, 2017 and
(ii)&nbsp;an aggregate of 1,867,457 shares of our Common Stock (the "Warrant Shares") issuable upon exercise of common stock purchase warrants issued on November&nbsp;14, 2017 (the "Warrants") in
a private placement transaction, which closed on November&nbsp;14, 2017. We are registering these shares on behalf of the Selling Stockholders, to be offered and sold by them from time to time. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
are not selling any shares of Common Stock under this prospectus and will not receive any of the proceeds from the sale of shares of Common Stock by the Selling Stockholders. However,
we may receive proceeds from the cash exercise of the Warrants, which, if exercised in cash at the current applicable exercise price with respect to all of the Warrants to purchase 1,867,457 shares of
Common Stock, would result in gross proceeds to the Company of $11.4&nbsp;million. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Selling Stockholders may offer the shares of our Common Stock and Warrant Shares from time to time and at such prices as each Selling Stockholder may determine through public or
private transactions or through other means described in the section entitled "Plan of Distribution" or a supplement to this prospectus. Each Selling Stockholder may also sell the shares under
Rule&nbsp;144 under the Securities Act of 1933, as amended, if available, rather than under this prospectus. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
are registering the offer and sale of the shares of our Common Stock and Warrant Shares pursuant to certain registration rights granted to the Selling Stockholders. The registration
of these shares does not necessarily mean that any of the shares will be offered or sold by the Selling Stockholders. The timing and amount of any sale is within the sole discretion of each Selling
Stockholder. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Selling Stockholders will pay all underwriting discounts and selling commissions, if any, in connection with the sale of the shares of Common Stock and Warrant Shares. We have agreed
to pay certain expenses in connection with this registration statement and to indemnify the Selling Stockholders against certain liabilities. To our knowledge, as of the date of this prospectus, no
underwriter or other person has been engaged to facilitate the sale of shares of Common Stock and Warrant Shares in this offering. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
are an emerging growth company as that term is used in the Jumpstart Our Business Startups Act of 2012 and, as such, have elected to comply with certain reduced public company
reporting requirements for this prospectus and future filings. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our
Common Stock is listed on The NASDAQ Global Market under the symbol "LPTX." On December&nbsp;7, 2017, the closing price of our Common Stock was $6.76 per share. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT
SIZE=3><B><I>Investing in our Common Stock involves a high degree of risk. You should carefully read the risks and uncertainties
included herein under the heading "Risk Factors" on page&nbsp;7 of this prospectus, and under similar headings in our Annual Report on Form&nbsp;10-K for the fiscal year ended December&nbsp;31,
2016 and our Quarterly Reports on Form&nbsp;10-Q for the quarterly periods ended March&nbsp;31, 2017, June&nbsp;30, 2017 and September&nbsp;30, 2017, which have been filed with the Securities
and Exchange Commission and are incorporated by reference in this prospectus and in the other documents that are filed after the date hereof and incorporated by reference into this
prospectus.</I></B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT SIZE=2><B>Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these
securities or passed upon the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.</B></FONT></P>
 <p style="font-family:times;line-height:1pt;margin-left:18pt;"><font> </FONT> <FONT SIZE=2>
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&nbsp;&nbsp;&nbsp;
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The date of this prospectus is&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;, 2017. </FONT></P>

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NAME="BG17801A_main_toc"></A> </FONT></P>

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<BR></FONT><FONT SIZE=2><B>  TABLE OF CONTENTS    <BR>    </B></FONT></P>

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<A NAME="BG17801_TOC"></A> </FONT></P>
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<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Page </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
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<TD VALIGN="TOP" style="font-family:times;"><A HREF="#bi17801_about_this_prospectus"><p style="font-family:times;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>ABOUT THIS PROSPECTUS</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#bi17801_about_this_prospectus"><FONT SIZE=2>1</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><A HREF="#ca17801_prospectus_summary"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>PROSPECTUS SUMMARY</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#ca17801_prospectus_summary"><FONT SIZE=2><BR>
2</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><A HREF="#da17801_risk_factors"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>RISK FACTORS</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#da17801_risk_factors"><FONT SIZE=2><BR>
7</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
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<TD VALIGN="TOP" style="font-family:times;"><A HREF="#dc17801_cautionary_note_regarding_forward-looking_statements"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>CAUTIONARY NOTE REGARDING FORWARD-LOOKING
STATEMENTS</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#dc17801_cautionary_note_regarding_forward-looking_statements"><FONT SIZE=2><BR>
10</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><A HREF="#dc17801_use_of_proceeds"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>USE OF PROCEEDS</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#dc17801_use_of_proceeds"><FONT SIZE=2><BR>
12</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
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<TD VALIGN="TOP" style="font-family:times;"><A HREF="#de17801_selling_stockholders"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>SELLING STOCKHOLDERS</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#de17801_selling_stockholders"><FONT SIZE=2><BR>
13</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
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<TD VALIGN="TOP" style="font-family:times;"><A HREF="#dg17801_plan_of_distribution"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>PLAN OF DISTRIBUTION</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#dg17801_plan_of_distribution"><FONT SIZE=2><BR>
17</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
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<TD VALIGN="TOP" style="font-family:times;"><A HREF="#dg17801_legal_matters"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>LEGAL MATTERS</FONT></A></TD>
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<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#dg17801_legal_matters"><FONT SIZE=2><BR>
19</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
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<TD VALIGN="TOP" style="font-family:times;"><A HREF="#dg17801_experts"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>EXPERTS</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#dg17801_experts"><FONT SIZE=2><BR>
19</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
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<TD VALIGN="TOP" style="font-family:times;"><A HREF="#dg17801_disclosure_of_commission_posit__dis03428"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>DISCLOSURE OF COMMISSION POSITION ON INDEMNIFICATION FOR
SECURITIES ACT LIABILITIES</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#dg17801_disclosure_of_commission_posit__dis03428"><FONT SIZE=2><BR>
19</FONT></A></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
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<TD VALIGN="TOP" style="font-family:times;"><A HREF="#dg17801_additional_information"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>ADDITIONAL INFORMATION</FONT></A></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><A HREF="#dg17801_additional_information"><FONT SIZE=2><BR>
19</FONT></A></TD>
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<TD VALIGN="TOP" style="font-family:times;"><A HREF="#dg17801_incorporation_of_certain_information_by_reference"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>INCORPORATION OF CERTAIN INFORMATION BY
REFERENCE</FONT></A></TD>
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<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
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20</FONT></A></TD>
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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A
NAME="bi17801_about_this_prospectus"> </A>
<A NAME="toc_bi17801_1"> </A>
<BR></FONT><FONT SIZE=2><B>  ABOUT THIS PROSPECTUS    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This prospectus is part of a registration statement on Form&nbsp;S-3 that we filed with the U.S. Securities and Exchange Commission (the
"SEC"), using a "shelf" registration process. By using such registration statement, the selling stockholders identified herein (the "Selling Stockholders") may, from time to time, offer and sell (in
one or more transactions as described under "Plan of Distribution") up to 3,734,914 shares of our common stock, par value $0.001 per share (the "Common Stock"), including 1,867,457 shares of Common
Stock issuable upon the exercise of the warrants (the "Warrant Shares") issued in our private placement offering which closed on November&nbsp;14, 2017. We will not receive any of the proceeds from
the sales of the Common Stock by the Selling Stockholders. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This
prospectus provides you with a general description of us and our securities. We may add, update or change in a prospectus supplement any of the information contained in this
prospectus or the documents incorporated by reference. For further information about our business and our securities, you should refer to the registration statement and the reports incorporated by
reference in this
prospectus, as described in "Additional Information" and "Incorporation of Certain Information by Reference". This prospectus contains summaries of certain provisions contained in some of the
documents described herein, but reference is made to the actual documents for complete information. All of the summaries are qualified in their entirety by the actual documents. Copies of some of the
documents referred to herein have been filed, will be filed or will be incorporated by reference as exhibits to the registration statement of which this prospectus is a part, and you may obtain copies
of those documents as described below under the heading "Where You Can Find More Information." </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;You
must not rely upon any information or representation not contained or incorporated by reference in this prospectus. You should rely only on the information contained in this
prospectus and in any prospectus supplement (including in any documents incorporated by reference herein or therein). You should not assume that the information contained in this prospectus is
accurate on any date subsequent to the date set forth on the front of the document or that any information we have incorporated by reference is correct on any date subsequent to the date of the
document incorporated by reference, even though this prospectus is delivered or securities are sold on a later date. We and the Selling Stockholders have not authorized anyone to provide you with any
different information. The Selling Stockholders are offering to sell our securities, and seeking offers to buy, only in jurisdictions where offers and sales are permitted. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Leap
Therapeutics,&nbsp;Inc. and its subsidiaries are collectively referred to herein as "Leap", "the Company", "we", "us", and "our", unless otherwise specified or the context
indicates otherwise. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>1</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><I> </i></font></p>
<DIV style="width:100%;box-sizing:border-box;border:#000000 solid 1.0pt;padding-top:12.0pt;padding-right:12.0pt;padding-bottom:12.0pt;padding-left:12.0pt;">
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<A NAME="toc_ca17801_1"> </A>
<BR></FONT><FONT SIZE=2><B>  PROSPECTUS SUMMARY    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT SIZE=2><I>This summary highlights selected information appearing elsewhere or incorporated by reference into this prospectus and
may not contain all of the information that you need to consider in making your investment decision. You should read this prospectus, any applicable prospectus supplement, and any related free writing
prospectus that we have authorized for use in connection with this offering, and any documents incorporated by reference carefully, including the risks and uncertainties included herein under the
heading "Risk Factors" beginning on page&nbsp;7 in this prospectus and incorporated by reference from our most recent Annual Report on Form&nbsp;10-K and our most recent Quarterly Report on
Form&nbsp;10-Q, before making an investment decision.</I></FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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About Us  </B></FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B><I>



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Corporate Information  </I></B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Leap Therapeutics,&nbsp;Inc. was incorporated in the state of Delaware as Dekkun Corporation on January&nbsp;3, 2011 and changed its name to
HealthCare Pharmaceuticals,&nbsp;Inc. effective May&nbsp;29, 2014, and then to Leap Therapeutics,&nbsp;Inc. effective November&nbsp;16, 2015 (the "Company"). During 2015, HealthCare
Pharmaceuticals Pty&nbsp;Ltd. ("HCP Australia") was formed and is a wholly owned subsidiary of the Company. During January 2017, the Company merged with Macrocure&nbsp;Ltd. (now "Leap
Therapeutics&nbsp;Ltd.") and its wholly-owned subsidiary Macrocure,&nbsp;Inc. Our principal executive offices are located at 47 Thorndike Street, Suite B1-1, Cambridge, Massachusetts 02141, and
our telephone number is (617)&nbsp;714-0360. Our website address is www.leaptx.com. The information contained in, or that can be accessed through, our website is not part of this prospectus. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B><I>


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Our Company  </I></B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We are a biopharmaceutical company acquiring and developing novel therapeutics at the leading edge of cancer biology. Our approach is designed
to target compelling tumor-promoting and immuno-oncology pathways to generate durable clinical benefit and enhanced outcomes for patients. Our programs are monoclonal antibodies that target key
cellular pathways that enable cancer to grow and spread and specific mechanisms that activate the body's immune system to identify and attack cancer. Our two clinical stage programs
are:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> DKN-01: A monoclonal antibody targeting Dickkopf-related protein 1, or DKK1. DKK1 is a protein that regulates the Wnt signaling pathways, and
has an important role in tumor cell signaling and in mediating an immuno-suppressive tumor microenvironment. DKN-01 has been engineered to bind to DKK1 and to generate an anti-tumor effect through
altering the Wnt signaling pathways and the immune tumor microenvironment. We are testing DKN-01 in ongoing clinical trials in patients with esophagogastric cancer and biliary tract cancer. We have
studied DKN-01 as a monotherapy in patients with non-small cell lung cancer. Based on the patient responses and clinical benefit in these trials, we are also studying or planning to study DKN-01 in
patients with Wnt pathway alterations with gastric cancer, hepatocellular carcinoma, or endometrial cancer, and in combination with immune checkpoint inhibitors, such as Merck's KEYTRUDA &reg;
(pembrolizumab) or Roche's TECENTRIQ &reg; (atezolizumab). </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> TRX518: A monoclonal antibody targeting the glucocorticoid-induced tumor necrosis factor-related receptor, or GITR, a receptor found on the
surface of a wide range of immune cells. TRX518 has been specifically engineered to enhance the immune system's anti-tumor response by activating GITR signaling, or GITR agonism, to activate tumor
fighting white blood cells, or T effector cells, and decrease the activity of potentially tumor-protective white blood cells, or T&nbsp;regulatory cells, without causing the immune cells to be
destroyed. We believe GITR is an ideal immune system agonist target through this two-pronged approach of stimulating an anti-tumor response and reducing immune suppression. We are conducting two
clinical trials of TRX518 in patients with advanced solid tumors and have evidence of biomarker modulation and </FONT></DD></DL>
</UL>
 </DIV>
 <P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>2</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><I> </i></font></p>
<DIV style="width:100%;box-sizing:border-box;border:#000000 solid 1.0pt;padding-top:12.0pt;padding-right:12.0pt;padding-bottom:12.0pt;padding-left:12.0pt;">
 <UL>
<UL>

<P style="font-family:times;"><FONT SIZE=2>clinical
activity. Based on the results seen in these trials, we are studying the combination of TRX518 with a chemotherapy, gemcitabine, and in combination with immune checkpoint inhibitors in
patients with advanced solid tumors. </FONT></P>

</UL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
intend to apply our extensive experience identifying and developing transformational products to aggressively develop these antibodies and build a pipeline of programs that has the
potential to change the practice of cancer medicine. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our
operations to date have been limited to organizing and staffing our Company, business planning, raising capital, undertaking preclinical studies and clinical trials of DKN-01 and
TRX518, protecting our intellectual property and providing general and administrative support for these operations. To date, we have not generated any product revenue and have primarily financed our
operations through the private placement of our equity securities, including the Private Placement described below, business development activities, convertible note financings, and the merger with
Macrocure. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;As
of September&nbsp;30, 2017, we had received an aggregate of $88.3&nbsp;million in net proceeds comprised of $33.9&nbsp;million from the issuance of private equity securities,
$34.7&nbsp;million from the issuance of convertible notes and $19.7&nbsp;million from the merger with Macrocure. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
have never been profitable and have incurred net losses in each year since inception. As of September&nbsp;30, 2017, we had an accumulated deficit of $123.8&nbsp;million. During
the three months ended September&nbsp;30, 2017, our second full quarter operating as a public company, we incurred a net loss of $6.8&nbsp;million and our cash and cash equivalents decreased by
approximately $3.0&nbsp;million. The Company expects to continue to generate operating losses in the foreseeable future. We had cash and cash equivalents of $14.2&nbsp;million at
September&nbsp;30, 2017. We expect to incur significant expenses and increasing operating losses for the foreseeable future. We expect our research and development expenses to increase as we
continue the clinical trials of, and seek regulatory approval for, DKN-01 and TRX-518. If we obtain regulatory approval for DKN-01 or TRX518, we expect to incur significant commercialization expenses
related to product sales, marketing, manufacturing and distribution. Furthermore, we expect that our general and administrative costs will increase as we grow and operate as a public company. As a
result, we will need to generate significant revenue if we are to achieve profitability, and we may never be able to do so. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Prior
to the sale of our Common Stock and Warrants in the Private Placement as discussed below, we believed that our cash and cash equivalents and available-for-sale investments as of
September&nbsp;30, 2017 would be sufficient to fund our operating expenses and capital expenditure requirements into the second quarter of 2018. We closed the $18.0&nbsp;million Private Placement
on November&nbsp;14, 2017 and, when including net proceeds from the Private Placement along with our cash and cash equivalents and available-for-sale investments as of September&nbsp;30, 2017, we
believe we will have sufficient funds to cover our operating expenses and capital expenditure requirements into the first quarter of 2019. </FONT></P>

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Recent Events  </B></FONT></P>

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Private Placement  </I></B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;On November&nbsp;14, 2017, we entered into purchase agreements (collectively, the "Purchase Agreements") with certain institutional accredited
investors (collectively, the "Purchasers"). Each of the Purchase Agreements was on terms and conditions substantially similar to each other Purchase Agreement and pursuant to such Purchase Agreements,
we, in a private placement, agreed to issue and sell to the Purchasers an aggregate of 2,958,094 shares (the "Shares") of unregistered Common Stock, at a price per share of $6.085 (the "Shares"), each
share issued with a warrant (the "Warrants") to purchase one share of Common Stock (the "Warrant Shares") at an exercise price of $6.085 (the "Exercise Price") with an exercise period expiring seven
years after closing (the "Term"), for gross </FONT></P>
 </DIV>
 <P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>3</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><I> </i></font></p>
<DIV style="width:100%;box-sizing:border-box;border:#000000 solid 1.0pt;padding-top:12.0pt;padding-right:12.0pt;padding-bottom:12.0pt;padding-left:12.0pt;">
 <P style="font-family:times;"><FONT SIZE=2>proceeds
of approximately $18.0&nbsp;million (the "Private Placement"). If all of the Warrants are exercised in cash at the Exercise Price during the Term, the Company will receive proceeds of
approximately $18.0&nbsp;million and will issue an aggregate of 2,958,094 Warrant Shares. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;HealthCare
Ventures IX,&nbsp;L.P. and Eli Lilly and Company, each a more than 5% direct holder of our Common Stock, also purchased Common Stock and Warrants in the Private Placement.
Each of HealthCare Ventures IX,&nbsp;L.P. and Eli Lilly and Company agreed to purchase the Common Stock and Warrants on the same terms and conditions as the other Purchasers. Three of our directors
and executive officers are affiliated with HealthCare Ventures IX,&nbsp;L.P. and its affiliates. Additional information regarding Selling Stockholder ownership and affiliations is described below in
"Selling Stockholders." </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Subject
to stockholder approval of such provisions, the Warrants include full ratchet anti-dilution protection provisions. The Company expects to hold a special meeting of stockholders
for the stockholders to approve the full ratchet anti-dilution protection provisions, on or about January&nbsp;12, 2018. If the stockholders do not approve of the full ratchet anti-dilution
protection provisions, such provisions shall be of no force and effect. In connection with such approval, the Company, on November&nbsp;14, 2017, entered into a voting agreement with HealthCare
Ventures VIII,&nbsp;L.P., HealthCare Ventures IX,&nbsp;L.P. and HealthCare Ventures Strategic Fund,&nbsp;L.P. (collectively, the "HealthCare Parties"), who hold more than 50% of the shares
entitled to vote at such shareholder meeting, pursuant to which the HealthCare Parties agreed to vote all of their beneficially owned shares in favor of the any approval proposed at the special
meeting of stockholders. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Raymond
James&nbsp;&amp; Associates,&nbsp;Inc. and Ladenburg Thalmann&nbsp;&amp;&nbsp;Co.&nbsp;Inc. acted as the placement agents (the "Placement Agents") for the Private Placement
pursuant to an agreement with us dated as of November&nbsp;14, 2017 (the "Placement Agent Agreement"). Pursuant to the Placement Agent Agreement, we agreed to pay the Placement Agents a fee equal to
2.2% of the aggregate gross proceeds from the Private Placement plus the reimbursement of certain expenses. We plan to use the net proceeds from the Private Placement for general corporate purposes.
The Private Placement raised gross proceeds to the Company of approximately $18.0&nbsp;million and net proceeds to the Company of approximately $17.3&nbsp;million, which is after deducting
commissions to the Company's Placement Agents and estimated expenses of approximately $0.7&nbsp;million in the aggregate and excluding any potential proceeds to the Company upon the cash exercise of
the Warrants. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the terms of the Purchase Agreements, we were obligated to prepare and file with the SEC a registration statement (the "Registration Statement") to register for resale the
Shares and the Warrant Shares on or prior to the date 30&nbsp;days following the closing of the Private Placement, and use our best commercially reasonable efforts, subject to receipt of necessary
information from the Purchasers, to cause the SEC to declare the Registration Statement effective within 60&nbsp;days following the closing of the Private Placement or, if the Registration Statement
is selected for review by the SEC, within 90&nbsp;days following the closing of the Private Placement. In order to comply with such obligation, we are filing the Registration Statement of which this
prospectus forms&nbsp;a part. Two Purchasers have
opted not to register their Shares or Warrant Shares and therefore, such Shares and Warrant Shares are not included in this offering. </FONT></P>

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Implications of Being an Emerging Growth Company  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We are an "emerging growth company," as defined in the Jumpstart Our Business Startups Act of 2012. We will remain an emerging growth company
until the earlier of (i)&nbsp;the beginning of the first fiscal year following the fifth anniversary of our initial public offering, (ii)&nbsp;the beginning of the first fiscal year after our
annual gross revenue is $1.07&nbsp;billion or more, (iii)&nbsp;the date on which we have, during the previous three-year period, issued more than $1.0&nbsp;billion in non-convertible debt
securities </FONT></P>
 </DIV>
 <P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>4</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><I> </i></font></p>
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 <P style="font-family:times;"><FONT SIZE=2>and
(iv)&nbsp;as of the end of any fiscal year in which the market value of our Common Stock held by non-affiliates exceeded $700&nbsp;million as of the end of the second quarter of that fiscal
year. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;For
as long as we remain an "emerging growth company," we may take advantage of certain exemptions from various reporting requirements that are applicable to public companies that are
not "emerging growth companies" including, but not limited to, not being required to comply with the auditor attestation requirements of Section&nbsp;404 of the Sarbanes-Oxley Act, reduced
disclosure obligations regarding executive compensation and financial statements in our periodic reports and proxy statements, and exemptions from the requirements of holding a nonbinding advisory
vote to approve executive compensation and shareholder approval of any golden parachute payments not previously approved. We plan to take advantage of these reporting exemptions until we are no longer
an "emerging growth company." </FONT></P>
 </DIV>
 <P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>5</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2>&nbsp;<BR></FONT></P>


<P style="font-family:times;"><FONT SIZE=2><I> </i></font></p>
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<A NAME="toc_cc17801_1"> </A>
<BR></FONT><FONT SIZE=2><B>  THE OFFERING    <BR>    </B></FONT></P>
 <div style="display:none;*display:block;margin-top:-1pt;"></div>

 <DIV style="padding:0pt;position:relative;width:100%;margin-left:0%;">
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<TR><!-- TABLE COLUMN WIDTHS SET -->
<TD WIDTH="218pt" style="font-family:times;"></TD>
<TD WIDTH="12pt" style="font-family:times;"></TD>
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<TR VALIGN="TOP">
<TD style="font-family:times;"><p style="font-family:times;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Shares of Common Stock offered for resale by the Selling Stockholders:</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>3,734,914 shares, including 1,867,457 Warrant Shares</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Shares of Common Stock Outstanding at November 30, 2017:</FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><p style="font-family:times;margin-top:12pt;margin-left:0pt;text-indent:0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>12,354,014</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Use of Proceeds:</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><p style="font-family:times;margin-top:12pt;margin-left:0pt;text-indent:0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>We will not receive any of the proceeds from the sale of any of the shares that may be offered from time to time by the
Selling Stockholders.</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Risk Factors:</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><p style="font-family:times;margin-top:12pt;margin-left:0pt;text-indent:0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Investing in our Common Stock involves risks. Please refer to the sections titled "Risk Factors" beginning on page&nbsp;7 of
this prospectus, as well as the risks and uncertainties discussed under the section titled "Risk Factors" in our most recent Annual Report on Form&nbsp;10-K and any subsequent Quarterly Reports on Form&nbsp;10-Q or Current Reports on Form&nbsp;8-K;
"Cautionary Note Regarding Forward-Looking Statements" on page&nbsp;9 of this prospectus, and other information included or incorporated by reference in this prospectus supplement and the accompanying prospectus for a discussion of factors you should
carefully consider before investing our securities.</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-top:12pt;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>NASDAQ Global Market Symbol:</FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><p style="font-family:times;margin-top:12pt;margin-left:0pt;text-indent:0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>LPTX</FONT></TD>
</TR>
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 </DIV>
 <P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
are filing the Registration Statement of which this prospectus forms&nbsp;a part to permit the resale of shares of Common Stock that were issued, or will be issuable upon the
exercise of Warrants that were issued in connection with the Private Placement, as required by certain registration rights granted to the purchasers pursuant to the Purchase Agreements in the Private
Placement. Two Purchasers have opted not to register their Shares or Warrant Shares and therefore such Shares and Warrant Shares are not included in this offering. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Except
as otherwise indicated, all information in this prospectus excludes the following:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> 2,958,094 shares Common Stock issuable upon the exercise of the Warrants issued on November&nbsp;14, 2017 at an initial exercise price of
$6.085 per share; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> 156,016 shares of Common Stock issuable upon the exercise of stock options outstanding as of September&nbsp;30, 2017, having a weighted
average exercise price of $41.43 per share, pursuant to awards granted under the Macrocure 2008 Stock Option Plan; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> 121,873 shares of Common Stock issuable upon the exercise of stock options outstanding as of September&nbsp;30, 2017, having a weighted
average exercise price of $28.35 per share, pursuant to awards granted under the Macrocure 2013 Share Incentive Plan; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> 1,380,677 shares of Common Stock issuable upon the exercise of stock options outstanding as of September&nbsp;30, 2017, having a weighted
average exercise price of $9.76 per share, pursuant to awards granted under our Amended and Restated 2012 Equity Incentive Plan; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> 204,055 shares of Common Stock issuable upon the exercise of stock options outstanding as of September&nbsp;30, 2017, having a weighted
average exercise price of $9.78 per share, pursuant to awards granted under our 2016 Equity Incentive Plan; and </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> 650,266 shares of our Common Stock reserved for future issuance under our 2016 Equity Incentive Plan as of September&nbsp;30, 2017. </FONT></DD></DL>
</UL>
 </DIV>
 <P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>6</FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A
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<BR></FONT><FONT SIZE=2><B>  RISK FACTORS    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT SIZE=2><I>An investment in our securities involves a high degree of risk. Before making an investment decision, you should
carefully consider the risks described below and under "Risk Factors" in any applicable prospectus supplement and in our most recent Annual Report on Form&nbsp;10-K, and in our updates to those Risk
Factors in our Quarterly Reports on Form&nbsp;10-Q or Current Reports on Form&nbsp;8-K following the most recent Form&nbsp;10-K, and in all other information appearing in this prospectus or
incorporated by reference into this prospectus and any applicable prospectus supplement. The material risks and uncertainties that management believes affect us will be described in those documents.
In addition to those risk factors, there may be additional risks and uncertainties of which management is not aware or focused on or that management deems immaterial. Our business, financial condition
or results of operations could be materially adversely affected by any of these risks. The trading price of our securities could decline due to any of these risks, and you may lose all or part of your
investment. This prospectus is qualified in its entirety by these risk factors.</I></FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Additional Risks Relating to This Offering and Our Common Stock  </B></FONT></P>

<P style="font-family:times;;margin-left:0pt;text-indent:-0pt;"><FONT SIZE=2><B><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;


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The sale of a substantial amount of our Common Stock, including resale of the shares of Common Stock issuable
upon the exercise of Warrants acquired in the Private Placement, in the public market after this offering could adversely affect the prevailing market price of our Common Stock and cause stockholders
to experience dilution.  </I></B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We have outstanding an aggregate of 12,354,014 shares of our Common Stock as of November&nbsp;30, 2017. The Warrants are exercisable for an
aggregate of 2,958,094 shares of Common Stock, subject to adjustment as provided in the Warrants, including 1,867,457 shares of Common Stock being offered pursuant to this prospectus. The Warrants are
exercisable at any time. Pursuant to the registration rights granted in the Private Placement, we agreed to register the resale by the Selling Stockholders named herein of the shares of Common Stock
issuable upon exercise of the Warrants. Two Purchasers have opted not to register their Shares or Warrant Shares and therefore, such Shares and Warrant Shares are not included in this offering. Upon
such registration, these registered shares will become generally available for immediate resale. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Sales
of substantial amounts of shares of our Common Stock in the public market, or the perception that such sales might occur, could adversely affect the market price of our Common
Stock, and the market value of our other securities, and could result in dilution to shareholders who hold our Common Stock. Further, pursuant to the terms of the Purchase Agreements and the Warrants,
we have agreed to solicit stockholder approval in connection with Nasdaq Rule&nbsp;5635(d) pursuant to a proxy statement that we plan to file with the SEC for the inclusion of a full ratchet
anti-dilution feature as a term of the Warrants. If stockholder approval of the inclusion of such anti-dilution feature is obtained, and if we issue Common Stock, options or Common Stock equivalents
at a price less than the exercise price of the Warrants, subject to certain customary exceptions, the exercise price of the Warrants will be reduced to that lower price. Such a decrease in exercise
price may cause holders to exercise the Warrants which could result in dilution to our existing stockholders at an accelerated rate. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
addition, we may issue additional shares of Common Stock or other equity or debt securities convertible into Common Stock in connection with a future financing, acquisition, employee
arrangements or otherwise. Any such issuance could result in substantial dilution to our stockholders and could cause our stock price to decline. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;A
substantial number of shares of Common Stock are being offered by this prospectus, and we cannot predict if and when the purchasers may sell such shares in the public markets. In
addition, certain
holders of shares of our Common Stock have additional rights, subject to some conditions, to require us to file registration statements covering the sale of their shares or to include their shares in
registration statements that we may file for ourselves or other stockholders. We have also registered the </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>7</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2>offer
and sale of all shares of Common Stock that we may issue under our equity compensation plans. Furthermore, in the future, we may issue additional shares of Common Stock or other equity or debt
securities convertible into Common Stock in connection with a financing, acquisition, litigation settlement, employee arrangements or otherwise. Any such issuance could result in substantial dilution
to our existing stockholders and could cause our stock price to decline. </FONT></P>

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We may become obligated to pay liquidated damages if we fail to file, obtain effectiveness and maintain
effectiveness of a registration statement under the Purchase Agreements we entered into with the Selling Stockholders.  </I></B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We have granted to the Selling Stockholders resale registration rights pursuant to the terms of Purchase Agreements. In addition to the
registration rights, the Selling Stockholders are entitled to receive liquidated damages upon the occurrence of a number of events relating to filing the Registration Statement, the Registration
Statement becoming effective and maintaining an effective registration statement covering the securities being registered. The liquidated damages will be payable upon the occurrence of each of those
events and each monthly anniversary thereof until cured. The amount of liquidated damages payable per 30-day period is equal to 1.0% of the purchase price paid by such Purchaser and may increase to
2.0% under certain circumstances, provided, however, the maximum aggregate liquidated damages payable to a Selling Stockholder is 10% of the aggregate purchase price paid by a Purchaser for the Shares
and Warrants pursuant to the Purchase Agreement. We may also be responsible for the actual damages suffered by a Selling Stockholder in certain circumstances. </FONT></P>

<P style="font-family:times;;margin-left:0pt;text-indent:-0pt;"><FONT SIZE=2><B><I>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;


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Our share price may be volatile, which could subject us to securities class action litigation and our
stockholders could incur substantial losses.  </I></B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The market price of shares of our Common Stock could be subject to wide fluctuations in response to many risk factors listed in this section,
and others beyond our control, including:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the results of clinical trials or development activities of our programs, or any future programs we may acquire; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> actual or anticipated fluctuations in our financial condition and operating results; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> failure to meet or exceed financial estimates and projections of the investment community or that we provide to the public; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> issuance of new or updated research or reports by securities analysts; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> fluctuations in the valuation of companies perceived by investors to be comparable to us; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> additions or departures of key management or other personnel; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> disputes or other developments related to proprietary rights, including patents, litigation matters, and our ability to obtain patent
protection for our technologies; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> announcement or expectation of additional debt or equity financing efforts; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> sales of our Common Stock by us, our insiders or our other stockholders; and </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> general economic and market conditions. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;These
and other market and industry factors may cause the market price and demand for our Common Stock to fluctuate substantially, regardless of our actual operating performance, which
may limit or prevent investors from readily selling their shares of Common Stock and may otherwise negatively affect the liquidity of our Common Stock. In addition, the stock market in general, and
NASDAQ and emerging growth companies in particular, have experienced extreme price and volume </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>8</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2>fluctuations
that have often been unrelated or disproportionate to the operating performance of these companies. In the past, when the market price of a stock has been volatile, holders of that stock
have instituted securities class action litigation against the company that issued the stock. If in the future any of our stockholders brought a lawsuit against us, we could incur significant legal
expenses, settlement costs or damage awards that are not covered by, or exceed the limits of, our available directors' and officers' liability insurance, which could adversely impact our financial
condition, results of operations or cash flows. Such a lawsuit could also divert the time and attention of our management. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>9</FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A
NAME="dc17801_cautionary_note_regarding_forward-looking_statements"> </A>
<A NAME="toc_dc17801_1"> </A>
<BR></FONT><FONT SIZE=2><B>  CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This prospectus and each prospectus supplement, including the documents that we incorporate by reference, contains or may contain
forward-looking statements as that term is defined in the federal securities laws. The events described in forward-looking statements contained in this prospectus, including the documents that we
incorporate by reference, may not occur. Generally, these statements relate to our business plans or strategies, projected or anticipated benefits or other consequences of our plans or strategies,
financing plans, projected or anticipated benefits from acquisitions that we may make, or projections involving anticipated revenues, earnings or other aspects of our operating results or financial
position, and the outcome of any contingencies. Any such forward-looking statements are based on current expectations, estimates and projections of management. We intend for these forward-looking
statements to be covered by the safe-harbor provisions for forward-looking statements. Words such as "may," "expect," "believe," "anticipate," "project," "plan," "intend," "estimate," and "continue,"
and their opposites and similar expressions are intended to identify forward-looking statements. We caution you that these statements are not guarantees of future performance or events and are subject
to a number of uncertainties, risks and other influences. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Forward
looking statements involve known and unknown risks, uncertainties and other important factors that may cause our actual results, performance or achievements to be materially
different from any future results, performance or achievements expressed or implied by the forward looking statements. We believe that these factors include, but are not limited to, the
following:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our ability and plan to develop and commercialize DKN-01 and TRX518; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the status, timing and results of preclinical studies and clinical trials; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the potential benefits of DKN-01 and TRX518; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the timing of our product candidate development programs; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our ability to obtain and maintain regulatory approval of our product candidates; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our estimates of expenses and future revenues and profitability; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our estimates regarding our capital requirements and our needs for additional financing; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our estimates of the size of the potential markets for DKN-01 and TRX518; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our ability to attract collaborators with acceptable development, regulatory and commercial expertise; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the benefits to be derived from any collaborations, license agreements, and other acquisition efforts, including those relating to the
development and commercialization of DKN-01 and TRX518; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> sources of revenues and anticipated revenues, including contributions from any collaborations or license agreements for the development and
commercialization of products; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our ability to create an effective sales and marketing infrastructure if we elect to market and sell DKN-01 and TRX518 directly; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the rate and degree of market acceptance of DKN-01 and TRX518; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the timing and amount of reimbursement for DKN-01 and TRX518; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the success of other competing therapies that may become available; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the manufacturing capacity for DKN-01 and TRX518; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our intellectual property position; </FONT></DD></DL>
</UL>
<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>10</FONT></P>

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<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our ability to maintain and protect our intellectual property rights; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our results of operations, financial condition, liquidity, prospects, growth and strategies; and </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> changes in the industry in which we operate and the trends that effect the industry. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;You
should also consider carefully the statements set forth in the section titled "Risk Factors" or elsewhere in this prospectus and the documents incorporated or deemed incorporated
herein by reference, including but not limited to the risks described in under "Risk Factors" and elsewhere in our
most recent Annual Report on Form&nbsp;10-K and in our updates to those risk factors in our Quarterly Reports on Form&nbsp;10-Q and Current Reports on Form&nbsp;8-K and other factors described
elsewhere in this prospectus. Any one or more of these uncertainties, risks and other influences could materially affect our results of operations and whether forward-looking statements made by us
ultimately prove to be accurate. Our actual results, performance and achievements could differ materially from those expressed or implied in these forward-looking statements. Except as otherwise
required by law, we undertake no obligation to publicly update or revise any forward-looking statements, whether from new information, future events or otherwise. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;DKN-01
and TRX518 are investigational drugs undergoing clinical development and have not been approved by the U.S. Food and Drug Administration (the "FDA"), nor been submitted to the FDA
for approval. DKN-01 and TRX518 have not been, and may never be, approved by any regulatory agency or marketed anywhere in the world. Statements contained in this prospectus should not be deemed to be
promotional. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>11</FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A
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<A NAME="toc_dc17801_2"> </A>
<BR></FONT><FONT SIZE=2><B>  USE OF PROCEEDS    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We will not receive any proceeds from the sale of our Common Stock by the Selling Stockholders. However, we may receive proceeds from the cash
exercise of the Warrants, which, if exercised in cash at the current exercise price with respect to all 2,958,094 Warrant Shares, would result in gross proceeds to us of approximately
$18.0&nbsp;million, and if exercised in cash at the current exercise price with respect to the 1,867,457 Warrant Shares registered in this offering, would result in gross proceeds to us of
approximately $11.4&nbsp;million. The Warrants contain anti-dilution adjustments which, in the event that securities are issued by the Company in certain circumstances at a price lower than the
current exercise price of the Warrants, would lower the exercise price of the Warrants and reduce the proceeds to be received by us. The use of proceeds from such Warrant exercises, if any, will not
be subject to any restrictions. Under certain conditions set forth in the Warrants, the Warrants are exercisable on a cashless basis. If the Warrants are exercised on a cashless basis, we would not
receive any cash payment from the Selling Stockholders upon any exercise of the Warrants. For information about the Selling Stockholders, see "Selling Stockholders." </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Selling Stockholders will pay any underwriting discounts and brokerage commissions and any similar expenses they incur in disposing of the Common Stock. We will bear all other
reasonable costs, fees and expenses incurred in effecting the registration of the Common Stock covered by this prospectus, including all registration and filing fees, fees and expenses of compliance
with securities or
"blue sky" laws, listing application fees, printing expenses, transfer agent's and registrar's fees, costs of distributing prospectuses in preliminary and final form as well as any supplements
thereto, and fees and disbursements of counsel for the Company and the independent registered public accounting firm and other persons retained by the Company. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>12</FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A
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<A NAME="toc_de17801_1"> </A>
<BR></FONT><FONT SIZE=2><B>  SELLING STOCKHOLDERS    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;As described in the prospectus summary, in the Private Placement, the Purchasers acquired shares of our Common Stock and Warrants exercisable
for shares of our Common Stock, subject to the limitations described below. In connection with the closing of the Private Placement, we entered into Purchase Agreements containing certain registration
rights, pursuant to which we agreed to prepare and file one or more registration statements covering the resale of the shares of Common Stock issued in the Private Placement and issuable upon exercise
of the Warrants (without regard to the limitation described below), and to maintain the effectiveness of such registration statement(s) until the earliest of (i)&nbsp;two years after the effective
date of the registration statements(s), (ii)&nbsp;such time as all such shares of Common Stock and Warrant Shares have been sold in accordance with the registration statement(s) or in accordance
with Rule&nbsp;144 under the Securities Act, or (iii)&nbsp;such time as such shares of Common Stock and Warrant Shares may be sold by the Purchasers without volume limitations or other
restrictions, pursuant to Rule&nbsp;144 under the Securities Act. We are filing this Registration Statement to comply with our registration requirements under the Purchase Agreements. Two Purchasers
have opted not to register their Shares or Warrant Shares and therefore such Shares and Warrant Shares are not
included in this offering. For additional information regarding the issuance of Common Stock and the Warrants in the Private Placement, see "Prospectus Summary&#151;Private Placement." </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
following table sets forth for each Selling Stockholder, the name, the number and percentage of shares of Common Stock beneficially owned as of November 30, 2017, the maximum number
of shares of Common Stock that may be offered pursuant to this prospectus and the number and percentage of shares of Common Stock that would be beneficially owned after the sale of the maximum number
of shares of Common Stock pursuant to this prospectus. The information presented in the table is based on 12,354,014 shares of our Common Stock outstanding on November 30, 2017. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Warrants held by the Selling Stockholders are immediately exercisable and therefore, for purposes of the table below, shares of Common Stock and percentage ownership of shares
beneficially owned prior to the offering listed in the following table assumes the shares of Common Stock underlying the Warrants are deemed to be outstanding and to be beneficially owned by the
Selling Stockholder holding the Warrants, but are not treated as outstanding for the purpose of computing the percentage ownership of any other Selling Stockholder. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Under
the terms of the Warrants, certain Selling Stockholders may not exercise the Warrants to the extent such exercise would cause such Selling Stockholder, together with its affiliates
and attribution parties, to beneficially own a number of shares of Common Stock which would exceed 4.99% or 9.99% of our then outstanding Common Stock following such exercise, excluding for purposes
of such determination shares of Common Stock issuable upon exercise of the Warrants which have not been exercised. The number of shares in the second column does not reflect this limitation. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Only
those Selling Stockholders listed below may offer and sell the Common Stock pursuant to this prospectus and any accompanying prospectus supplement. The Selling Stockholders may
offer all or less than all of the shares listed in the table below for sale pursuant to this prospectus and any accompanying prospectus supplement from time to time. Accordingly, no estimate can be
given as to the shares of Common Stock that the Selling Stockholders will hold upon consummation of any such sales. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Beneficial
ownership is determined in accordance with the rules of the SEC, except that the following table does not reflect any applicable beneficial ownership limitation described
above, with the effect that beneficial ownership of the Selling Stockholders is calculated and presented (for purposes of disclosure in this prospectus only) on a fully as converted basis. Unless
otherwise indicated, this table is based on information supplied to us by the Selling Stockholders and certain of our records and, unless otherwise indicated, to our knowledge, the persons named in
the table have sole voting and investment </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>13</FONT></P>

<HR NOSHADE>
<P style='font-family:times;page-break-before:always'></p>
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<A NAME="page_de17801_1_14"> </A>

<P style="font-family:times;"><FONT SIZE=2><A HREF="#bg17801a_main_toc">Table of Contents</A></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>power
with respect to all shares beneficially owned, subject to community property laws where applicable. </FONT></P>
 <div style="display:none;*display:block;margin-top:-1pt;"></div>

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<TD WIDTH="12pt" style="font-family:times;"></TD>
<TD WIDTH="6pt" ALIGN="RIGHT" style="font-family:times;"></TD>
<TD WIDTH="50pt" style="font-family:times;"></TD>
<TD WIDTH="12pt" style="font-family:times;"></TD>
<TD WIDTH="6pt" ALIGN="RIGHT" style="font-family:times;"></TD>
<TD WIDTH="56pt" style="font-family:times;"></TD>
<TD WIDTH="12pt" style="font-family:times;"></TD>
<TD WIDTH="6pt" ALIGN="RIGHT" style="font-family:times;"></TD>
<TD WIDTH="88pt" style="font-family:times;"></TD>
<TD WIDTH="12pt" style="font-family:times;"></TD>
<TD WIDTH="6pt" ALIGN="RIGHT" style="font-family:times;"></TD>
<TD WIDTH="88pt" style="font-family:times;"></TD>
<TD WIDTH="12pt" style="font-family:times;"></TD>
<TD WIDTH="6pt" ALIGN="RIGHT" style="font-family:times;"></TD>
<TD WIDTH="41pt" style="font-family:times;"></TD>
<TD WIDTH="12pt" style="font-family:times;"></TD>
<TD WIDTH="6pt" ALIGN="RIGHT" style="font-family:times;"></TD>
<TD WIDTH="56pt" style="font-family:times;"></TD>
<TD WIDTH="12pt" style="font-family:times;"></TD>
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<TR VALIGN="BOTTOM">
<TH ALIGN="LEFT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=5 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Shares Beneficially<BR>
Owned<BR>
Prior to the Offering </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Maximum Number<BR>
of Shares of<BR>
Currently<BR>
Outstanding<BR>
Common Stock<BR>
Being Offered </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Maximum Number<BR>
of Shares of<BR>
Common Stock<BR>
Issuable Upon<BR>
Exercise of<BR>
Warrants Being<BR>
Offered </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=5 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Shares Beneficially<BR>
Owned<BR>
After the Offering </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
</TR>
<TR VALIGN="BOTTOM">
<TH NOWRAP  ALIGN="LEFT" style="font-family:times;"><DIV style="border-bottom:solid #000000 1.0pt;margin-bottom:0pt;width:auto;display:inline-block;*display:inline;zoom:1;;"><FONT SIZE=1><B>Name and Address of Selling<BR>
Stockholder

<!-- COMMAND=ADD_SCROPPEDRULE,auto;display:inline-block;*display:inline;zoom:1; -->

 </B></FONT></DIV></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Number </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Percent (%) </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="LEFT" style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="LEFT" style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Number </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Percent (%) </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
</TR>
<TR bgcolor="#CCEEFF" VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-left:9pt;text-indent:-9pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>


<!-- COMMAND=ADD_ROWSHADECOLOR,"#CCEEFF" -->


</FONT> <FONT SIZE=2><B>Valence Helix Investments,&nbsp;LLC</B></FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>517,666</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>4.1</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>258,833</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>258,833</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>0</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR bgcolor="#CCEEFF" VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-left:9pt;text-indent:-0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>


<!-- COMMAND=ADD_ROWSHADECOLOR,"#CCEEFF" -->


 c/o Valence Life Sciences,<BR>
590&nbsp;Madison Avenue,<BR>
21st&nbsp;Floor, New York, NY&nbsp;10022</FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-top:11pt;margin-left:9pt;text-indent:-9pt;"><FONT SIZE=2> </FONT><FONT SIZE=2><B>Kingsbrook Opportunities Master Fund&nbsp;LP(1)</B></FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
82,170</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
41,085</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
41,085</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
0</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-left:9pt;text-indent:-0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>c/o Kingsbrook Partners&nbsp;LP<BR>
689&nbsp;Fifth Avenue, 12th&nbsp;Floor<BR>
New York, NY&nbsp;10022</FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR bgcolor="#CCEEFF" VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-top:11pt;margin-left:9pt;text-indent:-9pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>


<!-- COMMAND=ADD_ROWSHADECOLOR,"#CCEEFF" -->


</FONT> <FONT SIZE=2><B>Lincoln Park Capital Fund,&nbsp;LLC(2)</B></FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
100,000</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
50,000</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
50,000</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
0</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR bgcolor="#CCEEFF" VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-left:9pt;text-indent:-0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>


<!-- COMMAND=ADD_ROWSHADECOLOR,"#CCEEFF" -->


 c/o Lincoln Park Capital,&nbsp;LLC<BR>
440&nbsp;N. Wells Street Suite&nbsp;410<BR>
Chicago, IL&nbsp;60654</FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-top:11pt;margin-left:9pt;text-indent:-9pt;"><FONT SIZE=2> </FONT><FONT SIZE=2><B>Tiburon Opportunity Fund&nbsp;LP(3)</B></FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
164,338</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
1.3</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
82,169</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
82,169</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
0</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-left:9pt;text-indent:-0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>c/o Bortel Investment<BR>
Management,&nbsp;LLC 13313&nbsp;Point<BR>
Richmond Beach&nbsp;Rd. NW<BR>
Gig Harbor, WA&nbsp;98332</FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR bgcolor="#CCEEFF" VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-top:11pt;margin-left:9pt;text-indent:-9pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>



<!-- COMMAND=ADD_ROWSHADECOLOR,"#CCEEFF" -->


</FONT> <FONT SIZE=2><B>DAFNA Lifescience&nbsp;L.P.(4)</B></FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
290,880</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
2.3</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
145,440</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
145,440</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
0</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR bgcolor="#CCEEFF" VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-left:9pt;text-indent:-0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>


<!-- COMMAND=ADD_ROWSHADECOLOR,"#CCEEFF" -->


 c/o DAFNA Capital MGM&nbsp;LLC<BR>
10990&nbsp;Wilshire Blvd Suite&nbsp;1400<BR>
Los Angeles, CA&nbsp;90024</FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-top:11pt;margin-left:9pt;text-indent:-9pt;"><FONT SIZE=2> </FONT><FONT SIZE=2><B>DAFNA Lifescience Select&nbsp;L.P.(5)</B></FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
202,136</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
1.6</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
101,068</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
101,068</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
0</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-left:9pt;text-indent:-0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>c/o DAFNA Capital MGM&nbsp;LLC<BR>
10990&nbsp;Wilshire Blvd Suite&nbsp;1400<BR>
Los Angeles, CA&nbsp;90024</FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR bgcolor="#CCEEFF" VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-top:11pt;margin-left:9pt;text-indent:-9pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>


<!-- COMMAND=ADD_ROWSHADECOLOR,"#CCEEFF" -->


</FONT> <FONT SIZE=2><B>Empery Asset Master,&nbsp;LTD(6)</B></FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
61,108</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
30,554</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
30,554</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
0</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR bgcolor="#CCEEFF" VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-left:9pt;text-indent:-0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>


<!-- COMMAND=ADD_ROWSHADECOLOR,"#CCEEFF" -->


 c/o Empery Asset<BR>
Management,&nbsp;LP, 1&nbsp;Rockefller<BR>
Plaza Suite&nbsp;1205 New York,<BR>
NY&nbsp;10020</FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-top:11pt;margin-left:9pt;text-indent:-9pt;"><FONT SIZE=2> </FONT><FONT SIZE=2><B>Empery Tax Efficient,&nbsp;LP(7)</B></FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
29,176</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
14,588</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
14,588</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
0</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-left:9pt;text-indent:-0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>c/o Empery Asset<BR>
Management,&nbsp;LP 1&nbsp;Rockefller<BR>
Plaza Suite&nbsp;1205, New York,<BR>
NY&nbsp;10020</FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR bgcolor="#CCEEFF" VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-top:11pt;margin-left:9pt;text-indent:-9pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>


<!-- COMMAND=ADD_ROWSHADECOLOR,"#CCEEFF" -->


</FONT> <FONT SIZE=2><B>Empery Tax Efficient II,&nbsp;LP(8)</B></FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
74,054</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
37,027</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
37,027</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
0</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR bgcolor="#CCEEFF" VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-left:9pt;text-indent:-0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>


<!-- COMMAND=ADD_ROWSHADECOLOR,"#CCEEFF" -->


 c/o Empery Asset<BR>
Management,&nbsp;LP 1&nbsp;Rockefller<BR>
Plaza Suite&nbsp;1205 New York,<BR>
NY&nbsp;10020</FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
</TABLE></DIV>
<!-- end of user-specified TAGGED TABLE -->
 </DIV>
 <P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>14</FONT></P>

<HR NOSHADE>
<P style='font-family:times;page-break-before:always'></p>
<!-- ZEQ.=2,SEQ=17,EFW="2234000",CP="LEAP THERAPEUTICS, INC.",DN="1",CHK=990535,FOLIO='14',FILE='DISK126:[17ZDM1.17ZDM17801]DE17801A.;16',USER='DSLOAN',CD=';8-DEC-2017;15:16' -->
<A NAME="page_de17801_1_15"> </A>

<P style="font-family:times;"><FONT SIZE=2><A HREF="#bg17801a_main_toc">Table of Contents</A></FONT></P>
 <div style="display:none;*display:block;margin-top:-1pt;"></div>

 <DIV style="padding:0pt;position:relative;width:54%;margin-left:10%;">
 <!-- COMMAND=ADD_TABLEWIDTH,"150%" -->

<!-- User-specified TAGGED TABLE -->
<DIV ALIGN="CENTER"><TABLE width="150%"  BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR><!-- TABLE COLUMN WIDTHS SET -->
<TD WIDTH="" style="font-family:times;"></TD>
<TD WIDTH="12pt" style="font-family:times;"></TD>
<TD WIDTH="6pt" ALIGN="RIGHT" style="font-family:times;"></TD>
<TD WIDTH="50pt" style="font-family:times;"></TD>
<TD WIDTH="12pt" style="font-family:times;"></TD>
<TD WIDTH="6pt" ALIGN="RIGHT" style="font-family:times;"></TD>
<TD WIDTH="56pt" style="font-family:times;"></TD>
<TD WIDTH="12pt" style="font-family:times;"></TD>
<TD WIDTH="6pt" ALIGN="RIGHT" style="font-family:times;"></TD>
<TD WIDTH="88pt" style="font-family:times;"></TD>
<TD WIDTH="12pt" style="font-family:times;"></TD>
<TD WIDTH="6pt" ALIGN="RIGHT" style="font-family:times;"></TD>
<TD WIDTH="88pt" style="font-family:times;"></TD>
<TD WIDTH="12pt" style="font-family:times;"></TD>
<TD WIDTH="6pt" ALIGN="RIGHT" style="font-family:times;"></TD>
<TD WIDTH="41pt" style="font-family:times;"></TD>
<TD WIDTH="12pt" style="font-family:times;"></TD>
<TD WIDTH="6pt" ALIGN="RIGHT" style="font-family:times;"></TD>
<TD WIDTH="56pt" style="font-family:times;"></TD>
<TD WIDTH="12pt" style="font-family:times;"></TD>
<!-- TABLE COLUMN WIDTHS END --></TR>

<TR VALIGN="BOTTOM">
<TH ALIGN="LEFT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=5 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Shares Beneficially<BR>
Owned<BR>
Prior to the Offering </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Maximum Number<BR>
of Shares of<BR>
Currently<BR>
Outstanding<BR>
Common Stock<BR>
Being Offered </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Maximum Number<BR>
of Shares of<BR>
Common Stock<BR>
Issuable Upon<BR>
Exercise of<BR>
Warrants Being<BR>
Offered </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=5 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Shares Beneficially<BR>
Owned<BR>
After the Offering </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
</TR>
<TR VALIGN="BOTTOM">
<TH NOWRAP  ALIGN="LEFT" style="font-family:times;"><DIV style="border-bottom:solid #000000 1.0pt;margin-bottom:0pt;width:auto;display:inline-block;*display:inline;zoom:1;;"><FONT SIZE=1><B>Name and Address of Selling<BR>
Stockholder

<!-- COMMAND=ADD_SCROPPEDRULE,auto;display:inline-block;*display:inline;zoom:1; -->

 </B></FONT></DIV></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Number </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Percent (%) </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="LEFT" style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="LEFT" style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT><BR></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Number </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH COLSPAN=2 ALIGN="CENTER" style="font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=1><B>Percent (%) </B></FONT></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-left:9pt;text-indent:-9pt;"><FONT SIZE=2> </FONT><FONT SIZE=2><B>Sabby Volatility Warrant Master Fund,&nbsp;Ltd.(9)</B></FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>400,000</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>3.2</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>200,000</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>200,000</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>0</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-left:9pt;text-indent:-0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>c/o Sabby Management,<BR>
10&nbsp;Mountainview Road,<BR>
Suite&nbsp;205 Upper Saddle River,<BR>
NJ,&nbsp;07458</FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR bgcolor="#CCEEFF" VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-top:11pt;margin-left:9pt;text-indent:-9pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>


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</FONT> <FONT SIZE=2><B>CVI Investments,&nbsp;Inc.(10)</B></FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
170,000</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
1.4</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
85,000</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
85,000</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
0</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR bgcolor="#CCEEFF" VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-left:9pt;text-indent:-0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>


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 c/o Heights Capital Management<BR>
101&nbsp;California Street Suite&nbsp;3250<BR>
San Francisco, CA&nbsp;94111</FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-top:11pt;margin-left:9pt;text-indent:-9pt;"><FONT SIZE=2> </FONT><FONT SIZE=2><B>Eli Lilly and Company</B></FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
2,301,000</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
17.5</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
821,693</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
821,693</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
657,614</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><BR>
4.6</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD VALIGN="TOP" style="font-family:times;"><p style="font-family:times;margin-left:9pt;text-indent:-0pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Lilly Corporate Center<BR>
Indianapolis, IN&nbsp;46285</FONT></TD>
<TD VALIGN="TOP" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
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 </DIV>
<DIV style="padding:0pt;position:relative;text-align:left;margin-left:10%;">
 <DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>*</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>Indicates
beneficial ownership of less than 1%.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(1)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>Kingsbrook
Partners&nbsp;LP ("Kingsbrook Partners") is the investment manager of Kingsbrook Opportunities Master Fund&nbsp;LP ("Kingsbrook Opportunities") and
consequently has voting control and investment discretion over securities held by Kingsbrook Opportunities. Kingsbrook Opportunities&nbsp;GP&nbsp;LLC ("Opportunities&nbsp;GP") is the general
partner of Kingsbrook Opportunities and may be considered the beneficial owner of any securities deemed to be beneficially owned by Kingsbrook Opportunities. KB&nbsp;GP&nbsp;LLC ("GP&nbsp;LLC")
is the general partner of Kingsbrook Partners and may be considered the beneficial owner of any securities deemed to be beneficially owned by Kingsbrook Partners. Ari J. Storch, Adam J. Chill and
Scott M. Wallace are the sole managing members of Opportunities&nbsp;GP and&nbsp;GP&nbsp;LLC and as a result may be considered beneficial owners of any securities deemed beneficially owned by
Opportunities&nbsp;GP and&nbsp;GP&nbsp;LLC. Each of Kingsbrook Partners, Opportunities&nbsp;GP,&nbsp;GP&nbsp;LLC and Messrs.&nbsp;Storch, Chill and Wallace disclaim beneficial ownership
of these securities.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(2)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>Joshua
Scheinfeld and Jonathan Cope, the principals of Lincoln Park are deemed to be beneficial owners of all the shares of common stock owned by Lincoln Park.
Messrs.&nbsp;Scheinfeld and Cope have shared voting and disposition power over the shares being offered.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(3)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>Mr.&nbsp;Peter
Bortel has voting and investment power over these securities.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(4)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>DAFNA
Lifescience&nbsp;L.P. is managed by DAFNA Capital Mgmt.&nbsp;LLC. Nathan Fishel and Fariba Ghodsian have voting and dispositive control with respect to the
securities being offered.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(5)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>DAFNA
Lifescience Select&nbsp;L.P. is managed by DAFNA Capital Mgmt.&nbsp;LLC. Nathan Fishel and Fariba Ghodsian have voting and dispositive control with respect
to the securities being offered. The address for DAFNA Lifescience Select&nbsp;L.P. is 10990 Wilshire Boulevard, Suite&nbsp;1400, Los Angeles, CA 90024.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(6)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>Empery
Asset Management&nbsp;LP, the authorized agent of Empery Asset Master&nbsp;Ltd ("EAM"), has discretionary authority to vote and dispose of the shares held
by EAM and may be deemed to be the beneficial owner of these shares. Martin Hoe and Ryan Lane, in their capacity as investment managers of Empery Asset Management&nbsp;LP, may also be deemed to have
investment discretion and voting power over the shares held by EAM. EAM, Mr.&nbsp;Hoe and Mr.&nbsp;Lane each disclaim any beneficial ownership of these shares.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(7)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>Empery
Asset Management&nbsp;LP, the authorized agent of Empery Tax Efficient,&nbsp;LP ("ETE"), has discretionary authority to vote and dispose of the shares
held by ETE and may be deemed to be the beneficial owner of these shares. Martin Hoe and Ryan Lane, in their capacity as investment managers of Empery Asset Management&nbsp;LP, may also be deemed to
have investment discretion and voting power over the shares held by ETE. ETE, Mr.&nbsp;Hoe and Mr.&nbsp;Lane each disclaim any beneficial ownership of these shares. </FONT></DD></DL>
 </DIV>
 <P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>15</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><A HREF="#bg17801a_main_toc">Table of Contents</A></FONT></P>
 <DIV style="padding:0pt;position:relative;text-align:left;margin-left:10%;">
 <DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(8)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>Empery
Asset Management&nbsp;LP, the authorized agent of Empery Tax Efficient II,&nbsp;LP ("ETE II"), has discretionary authority to vote and dispose of the
shares held by ETE II and may be deemed to be the beneficial owner of these shares. Martin Hoe and Ryan Lane, in their capacity as investment managers of Empery Asset Management&nbsp;LP, may also be
deemed to have investment discretion and voting power over the shares held by ETE II. ETE II, Mr.&nbsp;Hoe and Mr.&nbsp;Lane each disclaim any beneficial ownership of these shares.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(9)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>Sabby
Management,&nbsp;LLC serves as the investment manager of Sabby Volatility Warrant Master Fund&nbsp;Ltd. Hal Mintz is the manager of Sabby
Management,&nbsp;LLC and has voting and investment control of the securities held by Sabby VWMF. Each of Sabby Management,&nbsp;LLC and Hal Mintz disclaims beneficial ownership over the securities
beneficially owned by Sabby VWMF except to the extent of their respective pecuniary interest therein.
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>(10)</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>Heights
Capital Management,&nbsp;Inc., the authorized agent of CVI Investments,&nbsp;Inc. ("CVI"), has discretionary authority to vote and dispose of the
securities held by CVI and may be deemed to be the beneficial owner of these securities. Martin Kobinger, in his capacity as Investment Manager of Heights Capital Management,&nbsp;Inc., may also be
deemed to have investment discretion and voting power over the securities held by CVI. Mr.&nbsp;Kobinger disclaims any such beneficial ownership of the securities. CVI Investments,&nbsp;Inc. is
affiliated with one or more FINRA members, none of whom is currently expected to participate in the sale pursuant to the prospectus contained in this registration statement of the securities purchased
by CVI in the offering. </FONT></DD></DL>
 </DIV>
 <P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;No
offer or sale pursuant to this prospectus may occur unless the Registration Statement that includes this prospectus has been declared effective by the SEC and remains effective at the
time a Selling Stockholder offers or sells shares of Common Stock. We are required, under certain circumstances, to update, supplement or amend this prospectus to reflect material developments in our
business, financial position and results of operations and may do so by an amendment to this prospectus, a prospectus supplement or a future filing with the SEC incorporated by reference in this
prospectus. </FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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Relationships with the Selling Stockholders  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Prior to the Closing of the Private Placement, Eli Lilly and Company was a more than 5% direct holder of our outstanding Common Stock. The
purchase by Eli Lilly and Company of shares of our Common Stock and Warrant to purchase shares of our Common Stock in the Private Placement was approved by our board of directors in accordance with
our amended and restated by-laws and related party transaction policy. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>16</FONT></P>

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</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><A HREF="#bg17801a_main_toc">Table of Contents</A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A
NAME="dg17801_plan_of_distribution"> </A>
<A NAME="toc_dg17801_1"> </A>
<BR></FONT><FONT SIZE=2><B>  PLAN OF DISTRIBUTION    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Each Selling Stockholder of the securities named herein may, from time to time, sell any or all of their securities covered hereby on any stock
exchange, market or trading facility on which the securities are traded, in private transactions or otherwise. These sales may be at fixed or negotiated prices or at market prices prevailing at the
time of sale. A Selling Stockholder may use any one or more of the following methods when selling securities:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> ordinary brokerage transactions and transactions in which the broker-dealer solicits purchasers; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> block trades in which the broker-dealer will attempt to sell the securities as agent but may position and resell a portion of the block as
principal to facilitate the transaction; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> purchases by a broker-dealer as principal and resale by the broker-dealer for its account; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> an exchange distribution in accordance with the rules of the applicable exchange; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> privately negotiated transactions; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> settlement of short sales; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> in transactions through broker-dealers that agree with the Selling Stockholders to sell a specified number of such securities at a stipulated
price per security; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> through the writing or settlement of options or other hedging transactions, whether through an options exchange or otherwise; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> a combination of any such methods of sale; or </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> any other method permitted pursuant to applicable law. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Selling Stockholders may also sell securities under Rule&nbsp;144 or any other exemption from registration under the Securities Act, if available, rather than under this
prospectus. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Broker-dealers
engaged by the Selling Stockholders may arrange for other brokers-dealers to participate in sales. Broker-dealers may receive commissions or discounts from the Selling
Stockholders (or, if any broker-dealer acts as agent for the purchaser of securities, from the purchaser) in amounts to be negotiated, but, except as set forth in a supplement to this Prospectus, in
the case of an agency transaction not in excess of a customary brokerage commission in compliance with FINRA Rule&nbsp;2440; and in the case of a principal transaction a markup or markdown in
compliance with FINRA IM-2440. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
connection with the sale of the securities or interests therein, the Selling Stockholders may enter into hedging transactions with broker-dealers or other financial institutions,
which may in turn engage in short sales of the securities in the course of hedging the positions they assume. The Selling Stockholders may also sell securities short and deliver these securities to
close out their short positions, or loan or pledge the securities to broker-dealers that in turn may sell these securities. The Selling Stockholders may also enter into option or other transactions
with broker-dealers or other financial institutions or create one or more derivative securities which require the delivery to such broker-dealer or other financial institution of securities offered by
this prospectus, which securities such broker-dealer or other financial institution may resell pursuant to this prospectus (as supplemented or amended to reflect such transaction). </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Selling Stockholders may pledge or grant a security interest in some of all of the shares of Common Stock owned by them and, if any of them defaults in the performance of its secured
obligations, the pledgees or secured parties may offer and sell the shares of Common Stock from time to time pursuant to this prospectus or any supplement or amendment to this prospectus under
Rule&nbsp;424(b)(3) or other applicable provision of the Securities Act, amending, if necessary, the list of Selling Stockholders to include the pledgee, transferee or other successors in interest
as Selling </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>17</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2>Stockholders
under this prospectus. The Selling Stockholders also may transfer and donate the shares of Common Stock in other circumstances in which case the transferees, donees or other successors in
interest will be the selling beneficial owners for purposes of this prospectus. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Selling Stockholders and any broker-dealers or agents that are involved in selling the securities may be deemed to be "underwriters" within the meaning of the Securities Act in
connection with such sales. In such event, any commissions received by such broker-dealers or agents and any profit on the resale of the securities purchased by them may be deemed to be underwriting
commissions or discounts under the Securities Act. We are not aware that any Selling Stockholder has any written or oral agreement or understanding, directly or indirectly, with any person to
distribute the securities. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
are required to pay certain fees and expenses incurred by us incident to the registration of the securities. We have agreed to indemnify the Selling Stockholders against certain
losses, claims, damages and liabilities, including liabilities under the Securities Act. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
agreed to keep this prospectus effective until the earlier of (i)&nbsp;two years after the effective date of the registration statement(s) covering the resale of the shares of
Common Stock issued in the Private Placement and issuable upon exercise of the Warrants, (ii)&nbsp;such time as all such shares of Common Stock and the Warrant Shares have been sold in accordance
with the registration statement(s) or in accordance with Rule&nbsp;144 under the Securities Act, or (iii)&nbsp;such time as such shares of Common Stock and the Warrant Shares may be sold by the
Selling Stockholders without volume limitations or other restrictions pursuant to Rule&nbsp;144 under the Securities Act. The resale securities will be sold only through registered or licensed
brokers or dealers if required under applicable state securities laws. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Under
applicable rules and regulations under the Exchange Act, any person engaged in the distribution of the shares of Common Stock may not simultaneously engage in market making
activities with respect to the Common Stock for the applicable restricted period, as defined in Regulation&nbsp;M, prior to the commencement of the distribution. In addition, the Selling
Stockholders will be subject to applicable provisions of the Exchange Act and the rules and regulations thereunder, including Regulation&nbsp;M, which may limit the timing of purchases and sales of
the Common Stock by the Selling Stockholders or any other person. We will make copies of this prospectus available to the Selling Stockholders. Registration of the securities named herein does not
mean any of such securities will be offered and sold. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>18</FONT></P>

<HR NOSHADE>
<P style='font-family:times;page-break-before:always'></p>
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<A NAME="page_dg17801_1_19"> </A>

<P style="font-family:times;"><FONT SIZE=2><A HREF="#bg17801a_main_toc">Table of Contents</A></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A
NAME="dg17801_legal_matters"> </A>
<A NAME="toc_dg17801_2"> </A>
<BR></FONT><FONT SIZE=2><B>  LEGAL MATTERS    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The validity of the securities being offered hereby will be passed upon by Morgan, Lewis&nbsp;&amp; Bockius&nbsp;LLP. Julio E. Vega, a partner
at Morgan, Lewis&nbsp;&amp; Bockius, purchased 32,868 shares of Common Stock and Warrants to purchase 32,868 shares of Common Stock in the Private Placement, but is not included as a Selling Stockholder
in this prospectus and such shares are not being registered in this offering. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A
NAME="dg17801_experts"> </A>
<A NAME="toc_dg17801_3"> </A>
<BR></FONT><FONT SIZE=2><B>  EXPERTS    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The consolidated balance sheets of Leap Therapeutics,&nbsp;Inc. and Subsidiaries as of December&nbsp;31, 2016 and 2015, and the related
consolidated statements of operations and comprehensive loss, redeemable preferred stock and stockholders' deficiency, and cash flows for each of the years then ended, have been audited by
EisnerAmper&nbsp;LLP, independent registered public accounting firm, as stated in their report, which is incorporated herein by reference. Such financial statements have been incorporated herein by
reference in reliance on the report of such firm given upon their authority as experts in accounting and auditing. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A
NAME="dg17801_disclosure_of_commission_posit__dis03428"> </A>
<A NAME="toc_dg17801_4"> </A>
<BR></FONT><FONT SIZE=2><B>  DISCLOSURE OF COMMISSION POSITION<BR>  ON INDEMNIFICATION FOR SECURITIES ACT LIABILITIES    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Insofar as indemnification for liabilities arising under the Securities Act may be permitted to our directors, officers and controlling persons
pursuant to the foregoing provisions, or otherwise, we have been advised that in the opinion of the SEC such indemnification is against public policy as expressed in the Securities Act and is,
therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or
controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being
registered, we will, unless in the opinion of our counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification
by us is against public policy as expressed in the Securities Act and will be governed by the final adjudication of such issue. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A
NAME="dg17801_additional_information"> </A>
<A NAME="toc_dg17801_5"> </A>
<BR></FONT><FONT SIZE=2><B>  ADDITIONAL INFORMATION    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This prospectus is part of a Registration Statement on Form&nbsp;S-3 that we have filed with the SEC relating to the shares of our securities
being offered hereby. This prospectus does not contain all of the information in the Registration Statement and its exhibits. The Registration Statement, its exhibits and the documents incorporated by
reference in this prospectus and their exhibits, all contain information that is material to the offering of the Securities hereby. Whenever a reference is made in this prospectus to any of our
contracts or other documents, the reference may not be complete. You should refer to the exhibits that are a part of the Registration Statement in order to review a copy of the contract or documents.
The Registration Statement and the exhibits are available at the SEC's Public Reference Room or through its Website. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
file annual, quarterly and current reports, proxy statements and other information with the SEC. You can read and copy any materials we file with the SEC at its Public Reference Room
at 100&nbsp;F&nbsp;Street, N.E., Washington, D.C. 20549 and at its regional offices, a list of which is available on the Internet at http://www.sec.gov/contact/addresses.htm. You may obtain
information on the operation of the Public Reference Room by calling the SEC at 1-800-SEC-0330. The SEC maintains an Internet site at http://www.sec.gov that contains reports, proxy and information
statements, and other information regarding issuers, such as us, that file electronically with the SEC. Additionally, you may access our </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>19</FONT></P>

<HR NOSHADE>
<P style='font-family:times;page-break-before:always'></p>
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<P style="font-family:times;"><FONT SIZE=2><A HREF="#bg17801a_main_toc">Table of Contents</A></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>filings
with the SEC through our website at http://www.leaptx.com. The information on our website is not part of this prospectus. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
will provide you without charge, upon your oral or written request, with a copy of any or all reports, proxy statements and other documents we file with the SEC, as well as any or all
of the documents incorporated by reference in this prospectus or the Registration Statement (other than exhibits to such documents unless such exhibits are specifically incorporated by reference into
such documents). Requests for such copies should be directed to: </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>Investor
Relations<BR>
Leap Therapeutics,&nbsp;Inc.<BR>
47 Thorndike Street, Suite B1-1<BR>
Cambridge, Massachusetts 02141<BR>
Telephone number: (617)&nbsp;714-0360 </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;You
should rely only on the information in this prospectus and the additional information described above and under the heading "Incorporation of Certain Information by Reference" below.
We have not, and the Selling Stockholders have not, authorized any other person to provide you with different information. If anyone provides you with different or inconsistent information, you should
not rely upon it. The Selling Stockholders are not making an offer to sell these securities in any jurisdiction where the offer or sale is not permitted. You should assume that the information in this
prospectus was accurate on the date of the front cover of this prospectus only, and that any information we have incorporated by reference was accurate on the date of the document incorporated by
reference only. Our business, financial condition, results of operations and prospects may have changed since such date. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A
NAME="dg17801_incorporation_of_certain_information_by_reference"> </A>
<A NAME="toc_dg17801_6"> </A>
<BR></FONT><FONT SIZE=2><B>  INCORPORATION OF CERTAIN INFORMATION BY REFERENCE    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The SEC allows us to "incorporate by reference" information that we file with it into this prospectus, which means that we can disclose
important information to you by referring you to those documents. The information incorporated by reference is an important part of this prospectus. The information incorporated by reference is
considered to be a part of this prospectus, and information that we file later with the SEC will automatically update and supersede information contained in documents filed earlier with the SEC or
contained in this prospectus and any accompanying prospectus supplement. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
incorporate by reference the documents listed below that we have previously filed with the SEC:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our Annual Report on Form&nbsp;10-K for the fiscal year ended December&nbsp;31, 2016, filed with the SEC on March&nbsp;31, 2017; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our Quarterly Reports on Form&nbsp;10-Q for the fiscal quarter ended March&nbsp;31, 2017, filed with the SEC on May&nbsp;12, 2017, for
the fiscal quarter ended June&nbsp;30, 2017, filed with the SEC on August&nbsp;11, 2017, and for the fiscal quarter ended September&nbsp;30, 2017, filed with the SEC on November&nbsp;13, 2017; </FONT> <FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our Current Report on Form&nbsp;8-K filed with the SEC on January&nbsp;26, 2017, including the exhibits attached thereto and filed
therewith; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our Current Report on Form&nbsp;8-K filed with the SEC on June&nbsp;21, 2017; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> our Current Report on Form&nbsp;8-K filed with the SEC on November&nbsp;17, 2017, including the exhibits attached thereto and filed
therewith; and </FONT></DD></DL>
</UL>
<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>20</FONT></P>

<HR NOSHADE>
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<A NAME="page_dg17801_1_21"> </A>

<P style="font-family:times;"><FONT SIZE=2><A HREF="#bg17801a_main_toc">Table of Contents</A></FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> the description of our common stock contained in our Registration Statement on Form&nbsp;8-A, filed on January&nbsp;20, 2017, including any
amendments thereto or reports filed for the purposes of updating this description. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;All
reports and other documents that we file with the SEC under Sections&nbsp;13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of the Registration Statement but before the
termination of the offering of the Securities hereunder will also be considered to be incorporated by reference into this prospectus from the date of the filing of these reports and documents, and
will supersede the information herein; provided, however, that all reports or portions thereof that we "furnish" to the SEC will not be considered incorporated by reference into this prospectus. We
undertake to provide without charge to each person (including any beneficial owner) who receives a copy of this prospectus, upon written or oral request, a copy of all of the preceding documents that
are incorporated by reference (other than exhibits, unless the exhibits are specifically incorporated by reference into these documents). You may request a copy of these materials in the manner set
forth under the heading "Additional Information," above. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>21</FONT></P>

<HR NOSHADE>
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</FONT> <FONT SIZE=2><A HREF="#bg17801a_main_toc">Table of Contents</A> </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;<BR></FONT></P>


<P style="font-family:times;"><FONT SIZE=2><div
style="width:100%;border-top:solid #000000 3.0pt;padding:0in 0in 0in 0in;font-size:3.0pt;"></div>
<div style="width:100%;border-top:solid #000000 1.0pt;padding:0in 0in 0in 0in;font-size:4.0pt;"></div> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=4><B>3,734,914 Shares  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=4><B> Common Stock  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=4><B>
<IMG SRC="g530771.jpg" ALT="LOGO" WIDTH="322" HEIGHT="96">
  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=3><B>PROSPECTUS  </B></FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;,
 2017  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2><B> <div style="width:100%;border-top:solid #000000 1.0pt;padding:0in 0in 0in 0in;font-size:3.0pt;"></div>
<div style="width:100%;border-top:solid #000000 3.0pt;padding:0in 0in 0in 0in;font-size:4.0pt;"></div>  </B></FONT></P>

<HR NOSHADE>
<P style='font-family:times;page-break-before:always'></p>
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NAME="page_ja17801_1_1"> </A>

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</FONT></P>

<!-- TOC_END -->

<P style="font-family:times;"><FONT SIZE=2><A HREF="#bg17801a_main_toc">Table of Contents</A> </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A
NAME="ja17801_part_ii_information_not_required_in_the_prospectus"> </A>
<A NAME="toc_ja17801_1"> </A>
<BR></FONT><FONT SIZE=2><B>  PART II    <BR>    <BR>    INFORMATION NOT REQUIRED IN THE PROSPECTUS    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2><A
NAME="ja17801_item_14._other_expense__ja101991"> </A>
<A NAME="toc_ja17801_2"> </A></FONT> <FONT SIZE=2><B>  Item&nbsp;14.&nbsp;&nbsp;&nbsp;&nbsp;Other Expenses of Issuance and Distribution.    <BR>    </B></FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Set forth below is an estimate (except in the case of the registration fee) of the amount of fees and expenses to be incurred in connection with
the issuance and distribution of the offered securities registered hereby, other than underwriting discounts and commission, if any, incurred in connection with the sale of the offered securities. All
such amounts will be borne by Leap Therapeutics,&nbsp;Inc. </FONT></P>
 <div style="display:none;*display:block;margin-top:-1pt;"></div>

 <DIV style="padding:0pt;position:relative;width:70%;margin-left:15%;">
 <!-- COMMAND=ADD_TABLEWIDTH,"100%" -->

<!-- User-specified TAGGED TABLE -->
<DIV ALIGN="CENTER"><TABLE width="100%"  BORDER=0 CELLSPACING=0 CELLPADDING=0>
<TR><!-- TABLE COLUMN WIDTHS SET -->
<TD WIDTH="" style="font-family:times;"></TD>
<TD WIDTH="12pt" style="font-family:times;"></TD>
<TD WIDTH="7pt" ALIGN="RIGHT" style="font-family:times;"></TD>
<TD WIDTH="68pt" style="font-family:times;"></TD>
<TD WIDTH="12pt" style="font-family:times;"></TD>
<!-- TABLE COLUMN WIDTHS END --></TR>

<TR BGCOLOR="#CCEEFF" VALIGN="BOTTOM">
<TD style="font-family:times;"><p style="font-family:times;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>SEC Registration Fee</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>
<!-- -->
$</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>3,050.38</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR BGCOLOR="White" VALIGN="BOTTOM">
<TD style="font-family:times;"><p style="font-family:times;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Accounting Fees and Expenses</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>

<!-- -->
$</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>20,000</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR BGCOLOR="#CCEEFF" VALIGN="BOTTOM">
<TD style="font-family:times;"><p style="font-family:times;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Legal Fees and Expenses</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>
<!-- -->
$</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>300,000</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR BGCOLOR="White" VALIGN="BOTTOM">
<TD style="font-family:times;"><p style="font-family:times;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Miscellaneous Fees and Expenses</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>
<!-- -->
$</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>15,000 </FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR bgcolor="#FFFFFF"  VALIGN="BOTTOM">
<TD style="line-height:0pt;font-size:1.5pt;font-family:times;"><FONT SIZE=2>


<!-- COMMAND=ADD_ROWSHADECOLOR,"#FFFFFF" -->




<!-- COMMAND=ADD_GUTTERGRID,"line-height:0pt;font-size:1.5pt;" -->


 </font>&#8203;<font></FONT></TD>
<TD style="line-height:0pt;font-size:1.5pt;font-family:times;"><FONT SIZE=2></font>&#8203;<font></FONT></TD>
<TD style="line-height:0pt;font-size:1.5pt;font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=2></font>&#8203;


<!-- COMMAND=ADD_GRID,"border-bottom:solid #000000 1.0pt;" -->

 <font></FONT></TD>
<TD ALIGN="RIGHT" style="line-height:0pt;font-size:1.5pt;font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=2></font>&#8203;


<!-- COMMAND=ADD_GRID,"border-bottom:solid #000000 1.0pt;" -->

 <font></FONT></TD>
<TD style="line-height:0pt;font-size:1.5pt;font-family:times;"><FONT SIZE=2></font>&#8203;<font></FONT></TD>
</TR>

<TR BGCOLOR="#CCEEFF" VALIGN="BOTTOM">
<TD style="font-family:times;"><p style="font-family:times;margin-left:10pt;text-indent:-10pt;"><FONT SIZE=2> </FONT><FONT SIZE=2>Total</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>
<!-- -->
$</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>338,050.38 </FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR bgcolor="#FFFFFF"  VALIGN="BOTTOM">
<TD style="line-height:0pt;font-size:1.5pt;font-family:times;"><FONT SIZE=2>


<!-- COMMAND=ADD_ROWSHADECOLOR,"#FFFFFF" -->





<!-- COMMAND=ADD_GUTTERGRID,"line-height:0pt;font-size:1.5pt;" -->


 </font>&#8203;</TD>
<TD style="line-height:0pt;font-size:1.5pt;font-family:times;"><FONT SIZE=2></font>&#8203;<font></FONT></TD>
<TD style="line-height:0pt;font-size:1.5pt;font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=2></font>&#8203;


<!-- COMMAND=ADD_GRID,"border-bottom:solid #000000 1.0pt;" -->

 <font></FONT></TD>
<TD ALIGN="RIGHT" style="line-height:0pt;font-size:1.5pt;font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=2></font>&#8203;


<!-- COMMAND=ADD_GRID,"border-bottom:solid #000000 1.0pt;" -->

 <font></FONT></TD>
<TD style="line-height:0pt;font-size:1.5pt;font-family:times;"><FONT SIZE=2></font>&#8203;<font></FONT></TD>
</TR>

<TR bgcolor="#FFFFFF"  VALIGN="BOTTOM">
<TD style="line-height:0.75pt;font-size:0.75pt;font-family:times;"><FONT SIZE=2>


<!-- COMMAND=ADD_ROWSHADECOLOR,"#FFFFFF" -->




<!-- COMMAND=ADD_GUTTERGRID,"line-height:0.75pt;font-size:0.75pt;" -->


 </font>&#8203;<font></FONT></TD>
<TD style="line-height:0.75pt;font-size:0.75pt;font-family:times;"><FONT SIZE=2></font>&#8203;<font></FONT></TD>
<TD style="line-height:0.75pt;font-size:0.75pt;font-family:times;"><FONT SIZE=2></font>&#8203;<font></FONT></TD>
<TD ALIGN="RIGHT" style="line-height:0.75pt;font-size:0.75pt;font-family:times;"><FONT SIZE=2></font>&#8203;<font></FONT></TD>
<TD style="line-height:0.75pt;font-size:0.75pt;font-family:times;"><FONT SIZE=2></font>&#8203;<font></FONT></TD>
</TR>
<TR bgcolor="#FFFFFF"  VALIGN="BOTTOM">
<TD style="line-height:0pt;font-size:1.5pt;font-family:times;"><FONT SIZE=2>


<!-- COMMAND=ADD_ROWSHADECOLOR,"#FFFFFF" -->





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 </font>&#8203;</TD>
<TD style="line-height:0pt;font-size:1.5pt;font-family:times;"><FONT SIZE=2></font>&#8203;<font></FONT></TD>
<TD style="line-height:0pt;font-size:1.5pt;font-family:times;border-bottom:solid #000000 1.0pt;"><FONT SIZE=2></font>&#8203;


<!-- COMMAND=ADD_GRID,"border-bottom:solid #000000 1.0pt;" -->

 <font></FONT></TD>
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 <P style="font-family:times;"><FONT SIZE=2><A
NAME="ja17801_item_15._indemnification_of_directors_and_officers."> </A>
<A NAME="toc_ja17801_3"> </A></FONT> <FONT SIZE=2><B>  Item&nbsp;15.&nbsp;&nbsp;&nbsp;&nbsp;Indemnification of Directors and Officers.    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The Registrant is incorporated under the laws of the State of Delaware. Section&nbsp;145 of the Delaware General Corporation Law provides that
a Delaware corporation may indemnify any persons who are, or are threatened to be made, parties to any threatened, pending or completed action, suit or proceeding, whether civil, criminal,
administrative or investigative (other than an action by or in the right of such corporation), by reason of the fact that such person was an officer, director, employee or agent of such corporation,
or is or was serving at the request of such person as an officer, director, employee or agent of another corporation or enterprise. The indemnity may include expenses (including attorneys' fees),
judgments, fines and amounts paid in settlement actually and reasonably incurred by such person in connection with such action, suit or proceeding, provided that such person acted in good faith and in
a manner he or she reasonably believed to be in or not opposed to the corporation's best interests and, with respect to any criminal action or proceeding, had no reasonable cause to believe that his
or her conduct was illegal. A Delaware corporation may indemnify any persons who are, or are threatened to be made, a party to any threatened, pending or completed action or suit by or in the right of
the corporation by reason of the fact that such person was a director, officer, employee or agent of such corporation, or is or was serving at the request of such corporation as a director, officer,
employee or agent of another corporation or enterprise. The indemnity may include expenses (including attorneys' fees) actually and reasonably incurred by such person in connection with the defense or
settlement of such action or suit provided that such person acted in good faith and in a manner he or she reasonably believed to be in or not opposed to the corporation's best interests except that no
indemnification is permitted without judicial approval if the officer or director is adjudged to be liable to the corporation. Where an officer or director is successful on the merits or otherwise in
the defense of any action referred to above, the corporation must indemnify him or her against the expenses which such officer or director has actually and reasonably incurred. Our certificate of
incorporation and amended and restated bylaws provide for the indemnification of our directors and officers to the fullest extent permitted under the Delaware General Corporation Law. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Section&nbsp;102(b)(7)
of the Delaware General Corporation Law permits a corporation to provide in its certificate of incorporation that a director of the corporation shall not be
personally liable to the corporation or its stockholders for monetary damages for breach of fiduciary duties as a director, except for liability for any:</FONT></P>

<UL>
<DL compact>
<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> transaction from which the director derives an improper personal benefit; </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> act or omission not in good faith or that involves intentional misconduct or a knowing violation of law; </FONT></DD></DL>
</UL>
<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>II-1</FONT></P>

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<UL>
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<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> unlawful payment of dividends or redemption of shares; or </FONT><FONT SIZE=2>
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>&#149;</FONT></DT><DD style="font-family:times;"><FONT SIZE=2> breach of a director's duty of loyalty to the corporation or its stockholders. </FONT></DD></DL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Registrant's amended and restated certificate of incorporation includes such a provision. Expenses incurred by any officer or director in defending any such action, suit or
proceeding in advance of its final disposition shall be paid by the Registrant upon delivery to us of an undertaking, by or on behalf of such director or officer, to repay all amounts so advanced if
it shall ultimately be determined that such director or officer is not entitled to be indemnified by the Registrant. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;As
permitted by the Delaware General Corporation Law, the Registrant has entered into indemnification agreements with its directors and executive officers. These agreements, among other
things, require the Registrant to indemnify each director and officer to the fullest extent permitted by law and advance expenses to each indemnitee in connection with any proceeding in which
indemnification is available. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;At
present, there is no pending litigation or proceeding involving any of the Registrant's directors or executive officers as to which indemnification is required or permitted, and the
Registrant is not aware of any threatened litigation or proceeding that may result in a claim for indemnification. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
Registrant maintains an insurance policy covering its officers and directors with respect to certain liabilities, including liabilities arising under the Securities Act of 1933, as
amended, or otherwise.  </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><A
NAME="ja17801_item_16._exhibits."> </A>
<A NAME="toc_ja17801_4"> </A></FONT> <FONT SIZE=2><B>  Item&nbsp;16.&nbsp;&nbsp;&nbsp;&nbsp;Exhibits.    <BR>    </B></FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The exhibits required by Item&nbsp;601 of Regulation&nbsp;S-K and Item&nbsp;16 of this Registration Statement are listed in the Exhibit
Index immediately preceding the signature page and such list is incorporated herein by reference.  </FONT></P>

<P style="font-family:times;"><FONT SIZE=2><A
NAME="ja17801_item_17._undertakings."> </A>
<A NAME="toc_ja17801_5"> </A></FONT> <FONT SIZE=2><B>  Item&nbsp;17.&nbsp;&nbsp;&nbsp;&nbsp;Undertakings.    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(a)&nbsp;&nbsp;&nbsp;The
undersigned Registrant hereby undertakes: </FONT></P>

<UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(1)&nbsp;&nbsp;&nbsp;To
file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement: </FONT></P>

<UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;&nbsp;To
include any prospectus required by Section&nbsp;10(a)(3) of the Securities Act; </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)&nbsp;&nbsp;To
reflect in the prospectus any facts or events arising after the effective date of the registration statement (or the most recent post-effective amendment thereof)
which, individually or in the aggregate, represent a fundamental change in the information set forth in the registration statement. Notwithstanding the foregoing, any increase or decrease in volume of
securities offered (if the total dollar value of securities offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range may
be reflected in the form of prospectus filed with the Commission pursuant to Rule&nbsp;424(b) if, in the aggregate, the changes in volume and price represent no more than a 20% change in the maximum
aggregate offering price set forth in the "Calculation of Registration Fee" table in the effective registration statement; </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(iii)&nbsp;&nbsp;To
include any material information with respect to the plan of distribution not previously disclosed in the registration statement or any material change to such
information in the registration statement. </FONT></P>

</UL>
</UL>

<P style="font-family:times;"><FONT SIZE=2><I>Provided, however</I></FONT><FONT SIZE=2>, that paragraphs&nbsp;(i), (ii)&nbsp;and (iii)&nbsp;do not apply if the registration statement is on Form&nbsp;S-3 and the
information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the Commission by the registrant pursuant </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>II-2</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2>to
Section&nbsp;13 or Section&nbsp;15(d) of the Exchange Act that are incorporated by reference in the registration statement, or is contained in a form of prospectus filed pursuant to
Rule&nbsp;424(b) that is part of the registration statement; </FONT></P>

<UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(2)&nbsp;&nbsp;&nbsp;That,
for the purpose of determining any liability under the Securities Act, each such post-effective amendment shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(3)&nbsp;&nbsp;&nbsp;To
remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(5)&nbsp;&nbsp;&nbsp;That,
for the purpose of determining liability under the Securities Act to any purchaser: </FONT></P>

<UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(i)&nbsp;&nbsp;If
the registrant is relying on Rule&nbsp;430B, </FONT></P>

<UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(A)&nbsp;&nbsp;Each
prospectus filed by the registrant pursuant to Rule&nbsp;424(b)(3) shall be deemed to be part of the registration statement as of the date the filed prospectus
was deemed part of and included in the registration statement; and </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(B)&nbsp;&nbsp;Each
prospectus required to be filed pursuant to Rule&nbsp;424(b)(2), (b)(5) or (b)(7) as part of a registration statement in reliance on Rule&nbsp;430B relating to
an offering made pursuant to Rule&nbsp;415(a)(1)(i), (vii)&nbsp;or (x)&nbsp;for the purpose of providing the information required by Section&nbsp;10(a) of the Securities Act of 1933 shall be
deemed to be part of and included in the registration statement as of the earlier of the date such form of prospectus is first used after effectiveness or the date of the first contract of sale of
securities in the offering described in the prospectus. As provided in Rule&nbsp;430B, for liability purposes of the issuer and any person that is at that date an underwriter, such date shall be
deemed to be a new effective date of the registration statement relating to the securities in the registration statement to which that prospectus relates, and the offering of such securities at that
time shall be deemed to be the initial </FONT><FONT SIZE=2><I>bona fide</I></FONT><FONT SIZE=2> offering thereof. Provided, however, that no statement made
in a registration statement or prospectus that is part of the registration statement or made in a document incorporated or deemed incorporated by reference into the registration statement or
prospectus that is part of the registration statement will, as to a purchaser with a time of contract of sale prior to such effective date, supersede or modify any statement that was made in the
registration statement or prospectus that was part of the registration statement or made in any such document immediately prior to such effective date; or </FONT></P>

</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(ii)&nbsp;&nbsp;If
the registrant is subject to Rule&nbsp;430C, each prospectus filed pursuant to Rule&nbsp;424(b) as part of a registration statement relating to an offering,
other than registration statements relying on Rule&nbsp;430B or other than prospectuses filed in reliance on Rule&nbsp;430A, shall be deemed to be part of and included in the registration
statement as of the date it is first used after effectiveness. Provided, however, that no statement made in a registration statement or prospectus that is part of the registration statement or made in
a document incorporated or deemed incorporated by reference into the registration statement or prospectus that is part of the registration statement will, as to a purchaser with a time of contract of
sale prior to such first use, supersede or modify any statement that was made in the registration statement or prospectus that was part of the registration statement or made in any such document
immediately prior to such date of first use. </FONT></P>

</UL>
</UL>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(b)&nbsp;&nbsp;&nbsp;The
undersigned registrant hereby undertakes that, for purposes of determining any liability under the Securities Act, each filing of the registrant's annual report
pursuant to Section&nbsp;13(a) or Section&nbsp;15(d) of the Exchange Act that is incorporated by reference in this registration statement shall </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>II-3</FONT></P>

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<P style="font-family:times;"><FONT SIZE=2><A HREF="#bg17801a_main_toc">Table of Contents</A></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>be
deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;(h)&nbsp;&nbsp;&nbsp;Insofar
as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons of the registrant pursuant to
the foregoing provisions, or otherwise, the registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the
Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director,
officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the
securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question
whether such indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such issue. </FONT></P>

<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>II-4</FONT></P>

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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><A
NAME="jc17801_exhibit_index"> </A>
<A NAME="toc_jc17801_1"> </A>
<BR></FONT><FONT SIZE=2><B>  EXHIBIT INDEX    <BR>    </B></FONT></P>
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<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>4.1</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>#</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2><A HREF="http://www.sec.gov/Archives/edgar/data/1509745/000110465917069461/a17-27210_1ex4d1.htm">Form of Warrant, dated as of November&nbsp;14, 2017 by and among Leap Therapeutics,&nbsp;Inc. and the holders identified on
the schedule thereto (incorporated by reference to the Current Report on Form&nbsp;8-K (File No.&nbsp;001-37990) filed by the Registrant with the SEC on November&nbsp;17, 2017).</A></FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>5.1</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2><A HREF="a2234000zex-5_1.htm">Opinion of Morgan, Lewis&nbsp;&amp; Bockius&nbsp;LLP.</A></FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>10.1</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>#</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2><A HREF="http://www.sec.gov/Archives/edgar/data/1509745/000110465917069461/a17-27210_1ex10d1.htm">Form of Purchase Agreement, dated as of November&nbsp;14, 2017, by and among Leap Therapeutics,&nbsp;Inc. and the
purchasers identified on the schedule thereto (incorporated by reference to the Current Report on Form&nbsp;8-K (File No.&nbsp;001-37990) filed by the Registrant with the SEC on November&nbsp;17, 2017).</A></FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>23.1</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2><A HREF="a2234000zex-23_1.htm">Consent of EisnerAmper&nbsp;LLP.</A></FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
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<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>23.2</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2><A HREF="a2234000zex-5_1.htm">Consent of Morgan, Lewis and Bockius&nbsp;LLP (included in Exhibit&nbsp;5.1).</A></FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2>24.1</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>*</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2><A HREF="#Sig">Power of Attorney (included on Signature Page).</A></FONT></TD>
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<DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>*</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>Filed
herewith
<BR><BR></FONT></DD><DT style='font-family:times;margin-bottom:-11pt;'><FONT SIZE=2>#</FONT></DT><DD style="font-family:times;"><FONT SIZE=2>Previously
filed  </FONT></DD></DL>
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<P ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2><B> <A NAME="Sig"></A>SIGNATURES  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant to the requirements of the Securities Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all
of the requirements for filing on Form&nbsp;S-3 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Waltham,
Commonwealth of Massachusetts, on this December&nbsp;8, 2017. </FONT></P>
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<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD COLSPAN=3 style="font-family:times;"><FONT SIZE=2><B> LEAP THERAPEUTICS,&nbsp;INC.</B></FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD style="font-family:times;"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD style="font-family:times;"><BR><FONT SIZE=2> By:</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD ALIGN="CENTER" style="font-family:times;"><BR><FONT SIZE=2>/s/&nbsp;CHRISTOPHER K. MIRABELLI<BR>


<HR NOSHADE SIZE="1.0pt" WIDTH="100%" COLOR="#000000">

</FONT> <FONT SIZE=2> Christopher K. Mirabelli<BR></FONT> <FONT SIZE=2><I>President, Chief Executive Officer and Director</I></FONT></TD>
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 <P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;KNOW
ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints Christopher K. Mirabelli and Douglas E. Onsi, and each of them, as his or her
true and lawful agent, proxy and attorney-in-fact, each acting alone, with full power of substitution and resubstitution, for him or her and in his or her name, place and stead, in any and all
capacities, to (i)&nbsp;act on, sign, and file with the SEC any and all amendments (including post-effective amendments) to this Registration Statement together with all schedules and exhibits
thereto, (ii)&nbsp;act on, sign and file such certificates, instruments, agreements and other documents as may be necessary or appropriate in connection therewith, (iii)&nbsp;act on and file any
supplement to any prospectus included in this Registration Statement or any such amendment or any subsequent registration statement filed pursuant to Rule&nbsp;462(b) under the Securities Act and
(iv)&nbsp;take any and all actions which may be necessary or appropriate to be done, as fully for all intents and purposes as he or she might or could do in person, hereby approving, ratifying and
confirming all that such agent, proxy and attorney-in-fact or any of his substitutes may lawfully do or cause to be done by virtue thereof. </FONT></P>


<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Pursuant
to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated. </FONT></P>
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<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH NOWRAP  ALIGN="CENTER" style="font-family:times;"><DIV style="border-bottom:solid #000000 1.0pt;margin-bottom:0pt;width:auto;display:inline-block;*display:inline;zoom:1;;"><FONT SIZE=1><B>Title

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 </B></FONT></DIV></TH>
<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
<TH NOWRAP  ALIGN="CENTER" style="font-family:times;"><DIV style="border-bottom:solid #000000 1.0pt;margin-bottom:0pt;width:auto;display:inline-block;*display:inline;zoom:1;;"><FONT SIZE=1><B>Date

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 </B></FONT></DIV></TH>
</TR>
<TR VALIGN="BOTTOM">
<TD ALIGN="CENTER" style="font-family:times;"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD ALIGN="CENTER" VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>/s/&nbsp;CHRISTOPHER K. MIRABELLI<BR>


<HR NOSHADE SIZE="1.0pt" WIDTH="100%" COLOR="#000000">

</FONT> <FONT SIZE=2> Christopher K. Mirabelli</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2>President, Chief Executive Officer and Director (Principal Executive Officer)</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2>December&nbsp;8, 2017</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD ALIGN="CENTER" VALIGN="BOTTOM" style="font-family:times;"><BR><FONT SIZE=2>/s/&nbsp;DOUGLAS E. ONSI<BR>


<HR NOSHADE SIZE="1.0pt" WIDTH="100%" COLOR="#000000">

</FONT> <FONT SIZE=2> Douglas E. Onsi</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><BR><FONT SIZE=2>Senior Vice President, Chief Financial Officer, Treasurer and Assistant Secretary (Principal Financial and Accounting Officer)</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><BR><FONT SIZE=2>December&nbsp;8, 2017</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD ALIGN="CENTER" VALIGN="BOTTOM" style="font-family:times;"><BR><FONT SIZE=2>/s/&nbsp;JAMES CAVANAUGH<BR>


<HR NOSHADE SIZE="1.0pt" WIDTH="100%" COLOR="#000000">

</FONT> <FONT SIZE=2> James Cavanaugh</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><BR><FONT SIZE=2>Director</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><BR><FONT SIZE=2>December&nbsp;8, 2017</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD ALIGN="CENTER" VALIGN="BOTTOM" style="font-family:times;"><BR><FONT SIZE=2>/s/&nbsp;THOMAS DIETZ<BR>



<HR NOSHADE SIZE="1.0pt" WIDTH="100%" COLOR="#000000">

</FONT> <FONT SIZE=2> Thomas Dietz</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><BR><FONT SIZE=2>Director</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><BR><FONT SIZE=2>December&nbsp;8, 2017</FONT></TD>
</TR>
<TR VALIGN="TOP">
<TD ALIGN="CENTER" VALIGN="BOTTOM" style="font-family:times;"><BR><FONT SIZE=2>/s/&nbsp;WILLIAM LI<BR>


<HR NOSHADE SIZE="1.0pt" WIDTH="100%" COLOR="#000000">

</FONT> <FONT SIZE=2> William Li</FONT></TD>
<TD VALIGN="BOTTOM" style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><BR><FONT SIZE=2>Director</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><BR><FONT SIZE=2>December&nbsp;8, 2017</FONT></TD>
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<P style="font-family:times;"><FONT SIZE=2><A HREF="#bg17801a_main_toc">Table of Contents</A></FONT></P>
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<TH style="font-family:times;"><FONT SIZE=1>&nbsp;</FONT></TH>
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<TR VALIGN="BOTTOM">
<TD ALIGN="CENTER" style="font-family:times;"><BR><FONT SIZE=2>&nbsp;</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2><BR>
&nbsp;</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD ALIGN="CENTER" style="font-family:times;"><FONT SIZE=2>/s/&nbsp;JOHN LITTLECHILD<BR>


<HR NOSHADE SIZE="1.0pt" WIDTH="100%" COLOR="#000000">

</FONT> <FONT SIZE=2> John Littlechild</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2>Director</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2>December&nbsp;8, 2017</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD ALIGN="CENTER" style="font-family:times;"><BR><FONT SIZE=2>/s/&nbsp;JOSEPH LOSCALZO<BR>


<HR NOSHADE SIZE="1.0pt" WIDTH="100%" COLOR="#000000">

</FONT> <FONT SIZE=2> Joseph Loscalzo</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><BR><FONT SIZE=2>Director</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><BR><FONT SIZE=2>December&nbsp;8, 2017</FONT></TD>
</TR>
<TR VALIGN="BOTTOM">
<TD ALIGN="CENTER" style="font-family:times;"><BR><FONT SIZE=2>/s/&nbsp;NISSIM MASHIACH<BR>



<HR NOSHADE SIZE="1.0pt" WIDTH="100%" COLOR="#000000">

</FONT> <FONT SIZE=2> Nissim Mashiach</FONT></TD>
<TD style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><BR><FONT SIZE=2>Director</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><FONT SIZE=2><BR>&nbsp;</FONT></TD>
<TD VALIGN="MIDDLE" style="font-family:times;"><BR><FONT SIZE=2>December&nbsp;8, 2017</FONT></TD>
</TR>
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<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>a2234000zex-5_1.htm
<DESCRIPTION>EX-5.1
<TEXT>
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<P ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><A
NAME="kc17801_exhibit_5.1"> </A>
<A NAME="toc_kc17801_1"> </A>
<BR></FONT><FONT SIZE=2><B>  Exhibit&nbsp;5.1    <BR>    </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>December&nbsp;8,
2017 </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>Leap
Therapeutics,&nbsp;Inc.<BR>
47 Thorndike Street, Suite B1-1<BR>
Cambridge, MA 02141 </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>Re:&nbsp;&nbsp;&nbsp;&nbsp;</FONT><FONT
SIZE=2><I>Leap Therapeutics,&nbsp;Inc., Registration Statement on Form&nbsp;S-3</I></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>Ladies
and Gentlemen: </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
have acted as counsel for Leap Therapeutics,&nbsp;Inc., a Delaware corporation (the "</FONT><FONT SIZE=2><I>Company</I></FONT><FONT SIZE=2>"), in connection with the registration
statement on Form&nbsp;S-3 (the "</FONT><FONT SIZE=2><I>Registration Statement</I></FONT><FONT SIZE=2>") to be filed by the Company with the Securities and Exchange Commission (the
"</FONT><FONT SIZE=2><I>Commission</I></FONT><FONT SIZE=2>") under the Securities Act of 1933, as amended (the "</FONT><FONT SIZE=2><I>Act</I></FONT><FONT SIZE=2>"), on the date hereof. The
Registration Statement relates to the offer and sale, from time to time by certain stockholders of the Company identified in the Registration Statement, of up to 3,734,914 shares of our common stock,
par value $0.001 per share (the "</FONT><FONT SIZE=2><I>Common Stock</I></FONT><FONT SIZE=2>"), which includes (i)&nbsp;1,867,457 shares (the
"</FONT><FONT SIZE=2><I>Shares</I></FONT><FONT SIZE=2>") of our Common Stock issued on
November&nbsp;14, 2017 and (ii)&nbsp;an aggregate of 1,867,457 shares of our Common Stock (the "</FONT><FONT SIZE=2><I>Warrant Shares</I></FONT><FONT SIZE=2>") issuable upon exercise of common
stock purchase warrants issued on November&nbsp;14, 2017 (the "</FONT><FONT SIZE=2><I>Warrants</I></FONT><FONT SIZE=2>") that were sold and issued by the Company in a private placement transaction
pursuant to those certain Purchase Agreements, dated as of November&nbsp;14, 2017, by and between the Company and the purchasers identified therein (the "</FONT><FONT SIZE=2><I>Purchase
Agreement</I></FONT><FONT SIZE=2>"). This opinion is being furnished in accordance with the requirements of Item&nbsp;601(b)(5) of Regulation&nbsp;S-K. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;In
connection with this letter, we have examined originals, or copies certified or otherwise identified to our satisfaction, of (i)&nbsp;the Third Amended and Restated Certificate of
Incorporation of the Company (the "</FONT><FONT SIZE=2><I>Company Charter</I></FONT><FONT SIZE=2>"), (ii)&nbsp;the Registration Statement, (iii)&nbsp;the Purchase Agreements, (iv)&nbsp;the
Warrants and (v)&nbsp;such other corporate documents and records as we deemed appropriate for purposes of the opinions set forth herein. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
have assumed the genuineness of all signatures, the legal capacity of natural persons, the truth, accuracy and completeness of the information, representations and warranties
contained in the instruments, documents, certificates and records we have reviewed, the authenticity of the documents submitted to us as originals, the conformity to the original documents of all
documents submitted to us as certified, facsimile or photostatic copies, and the authenticity of the originals of all documents submitted to us as copies. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
have also assumed that (i)&nbsp;the Registration Statement and any amendments thereto will have become effective and comply with all applicable laws and no stop order suspending the
Registration Statement's effectiveness will have been issued and remain in effect, in each case, at the time the Shares and the Warrant Shares are offered and sold as contemplated by the Registration
Statement and (ii)&nbsp;all Shares and the Warrant Shares will be offered and sold in compliance with applicable federal and state securities laws and in the manner stated in the Registration
Statement and the applicable prospectus supplement. </FONT></P>

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<P style="font-family:times;"><FONT SIZE=2>Leap
Therapeutics,&nbsp;Inc.<BR>
December&nbsp;8, 2017<BR>
Page&nbsp;2 </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Based
on the foregoing, we are of the opinion that (i)&nbsp;the Shares and the Warrant Shares have been duly authorized and reserved for issuance by the Company and (ii)&nbsp;the
Shares are, and the Warrant Shares, when issued upon exercise of the Warrants, will be validly issued, fully paid and nonassessable. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;Our
opinion expressed above is subject to the following limitations, exceptions, qualifications and assumptions. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;The
opinion expressed herein is limited to the Delaware General Corporation Law and reported judicial decisions applicable thereto and we express no opinion as to laws of any other
jurisdiction. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;This
letter is effective only as of the date hereof. We do not assume responsibility for updating this letter as of any date subsequent to its date, and we assume no responsibility for
advising you of any changes with respect to any matters described in this letter that may occur, or facts that may come to our attention, subsequent to the date hereof. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We
hereby consent to the use of this opinion as Exhibit&nbsp;5.1 to the Registration Statement and to the reference to us under the caption "Legal Matters" in the prospectus included
in the Registration Statement. In giving such consent, we do not hereby admit that we are acting within the category of persons whose consent is required under Section&nbsp;7 of the Act or the rules
or regulations of the Commission thereunder. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>Very
truly yours, </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>/s/
Morgan, Lewis&nbsp;&amp; Bockius LLP </FONT></P>

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<FONT SIZE=2 style="font-family:times;"><A HREF="#toc_kc17801_1">Exhibit 5.1</A></FONT><BR>
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<TYPE>EX-23.1
<SEQUENCE>3
<FILENAME>a2234000zex-23_1.htm
<DESCRIPTION>EX-23.1
<TEXT>
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<P ALIGN="RIGHT" style="font-family:times;"><FONT SIZE=2><A
NAME="ke17801_exhibit_23.1"> </A>
<A NAME="toc_ke17801_1"> </A>
<BR></FONT><FONT SIZE=2><B>  Exhibit&nbsp;23.1    <BR>    </B></FONT></P>

<P style="font-family:times;;margin-left:10.0pt;text-indent:-10.0pt;"><FONT SIZE=2><B>


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CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM  </B></FONT></P>

<P style="font-family:times;"><FONT SIZE=2>We
consent to the incorporation by reference in this Registration Statement of Leap Therapeutics,&nbsp;Inc. on Form&nbsp;S-3 to be filed on or about December&nbsp;8, 2017 of our report dated
March&nbsp;31, 2017, on our audits of the consolidated financial statements as of December&nbsp;31, 2016 and 2015 and for each of the years then ended, which report was included in the Annual
Report on Form&nbsp;10-K filed on March&nbsp;31, 2017. We also consent to the reference to our firm under the caption "Experts" in the Registration Statement on Form&nbsp;S-3. </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>/s/
EisnerAmper&nbsp;LLP </FONT></P>

<P style="font-family:times;"><FONT SIZE=2>Philadelphia,
Pennsylvania<BR>
December&nbsp;8, 2017 </FONT></P>

<HR NOSHADE>
<P style='font-family:times;page-break-before:always'></p>
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<P><br><A NAME="17ZDM17801_3">QuickLinks</A><br></P><!-- TOC_BEGIN -->
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<FONT SIZE=2 style="font-family:times;"><A HREF="#toc_ke17801_1">Exhibit 23.1</A></FONT><BR>
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end
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
