<SEC-DOCUMENT>0001047469-17-007570-index.html : 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>
<DOCUMENT>
<TYPE>S-3
<SEQUENCE>1
<FILENAME>a2234000zs-3.htm
<DESCRIPTION>S-3
<TEXT>
Document 1 - file: a2234000zs-3.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-5.1
<SEQUENCE>2
<FILENAME>a2234000zex-5_1.htm
<DESCRIPTION>EX-5.1
<TEXT>
Document 2 - file: a2234000zex-5_1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>3
<FILENAME>a2234000zex-23_1.htm
<DESCRIPTION>EX-23.1
<TEXT>
Document 3 - file: a2234000zex-23_1.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g530771.jpg
<DESCRIPTION>G530771.JPG
<TEXT>
Document 4 - file: g530771.jpg

</DOCUMENT>
</SEC-DOCUMENT>