<SEC-DOCUMENT>0001104659-25-019482.txt : 20250303
<SEC-HEADER>0001104659-25-019482.hdr.sgml : 20250303
<ACCEPTANCE-DATETIME>20250303072731
ACCESSION NUMBER:		0001104659-25-019482
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		14
CONFORMED PERIOD OF REPORT:	20250303
ITEM INFORMATION:		Results of Operations and Financial Condition
ITEM INFORMATION:		Regulation FD Disclosure
ITEM INFORMATION:		Financial Statements and Exhibits
FILED AS OF DATE:		20250303
DATE AS OF CHANGE:		20250303

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Mersana Therapeutics, Inc.
		CENTRAL INDEX KEY:			0001442836
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		ORGANIZATION NAME:           	03 Life Sciences
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38129
		FILM NUMBER:		25693781

	BUSINESS ADDRESS:	
		STREET 1:		840 MEMORIAL DRIVE
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02139
		BUSINESS PHONE:		617-498-0020

	MAIL ADDRESS:	
		STREET 1:		840 MEMORIAL DRIVE
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02139

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MERSANA THERAPEUTICS INC
		DATE OF NAME CHANGE:	20080813
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<p style="margin: 0; font-size: 10pt"><span style="font: 10pt Times New Roman, Times, Serif">&#160;</span></p>

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<p style="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>UNITED STATES</b></p>

<p style="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>SECURITIES AND EXCHANGE COMMISSION</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>Washington, D.C. 20549</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

<p style="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>FORM <span id="xdx_903_edei--DocumentType_c20250303__20250303_zGSHWUazaG62"><ix:nonNumeric contextRef="AsOf2025-03-03" id="Fact000009" name="dei:DocumentType">8-K</ix:nonNumeric></span></b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>CURRENT REPORT</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>Pursuant to Section 13 or 15(d) <br/>
of the
Securities Exchange Act of 1934</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Date of Report (Date of earliest event
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p>



<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>(Exact name of registrant as specified in its
charter)</b></p>

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<td style="vertical-align: top; text-align: center"><b>(State or other jurisdiction <br/>
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<td style="vertical-align: top; text-align: center"><p style="text-align: center; margin-top: 0; margin-bottom: 0"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>(Commission</b></span></p>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center">Registrant&#8217;s telephone number, including
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>Not Applicable</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Former name or former address, if changed since
last report)</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-right: 0; margin-bottom: 0pt; text-align: justify">Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (<span style="text-decoration: underline">see</span> General Instruction A.2. below):</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: -0.25in"><span id="xdx_908_edei--WrittenCommunications_c20250303__20250303_zaTSRLv92Evj" style="font-family: Wingdings"><ix:nonNumeric contextRef="AsOf2025-03-03" format="ixt:booleanfalse" id="Fact000021" name="dei:WrittenCommunications">&#168;</ix:nonNumeric></span><span style="font-family: Times New Roman, Times, Serif">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Written
communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: -0.25in">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: -0.25in"><span id="xdx_905_edei--SolicitingMaterial_c20250303__20250303_zWCBt7W9iyha" style="font-family: Wingdings"><ix:nonNumeric contextRef="AsOf2025-03-03" format="ixt:booleanfalse" id="Fact000022" name="dei:SolicitingMaterial">&#168;</ix:nonNumeric></span><span style="font-family: Times New Roman, Times, Serif">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Soliciting
material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: -0.25in">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: -0.25in"><span id="xdx_90E_edei--PreCommencementTenderOffer_c20250303__20250303_zm85fZkaplC4" style="font-family: Wingdings"><ix:nonNumeric contextRef="AsOf2025-03-03" format="ixt:booleanfalse" id="Fact000023" name="dei:PreCommencementTenderOffer">&#168;</ix:nonNumeric></span><span style="font-family: Times New Roman, Times, Serif">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Pre-commencement
communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: -0.25in">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.25in; text-indent: -0.25in"><span style="font-family: Wingdings"><span id="xdx_90D_edei--PreCommencementIssuerTenderOffer_c20250303__20250303_zxxMEaMEF7U3"><ix:nonNumeric contextRef="AsOf2025-03-03" format="ixt:booleanfalse" id="Fact000024" name="dei:PreCommencementIssuerTenderOffer">&#168;</ix:nonNumeric></span></span><span style="font-family: Times New Roman, Times, Serif">&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;&#160;Pre-commencement
communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; color: #221E1F">Securities registered pursuant to Section 12(b)
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; color: #221E1F">&#160;</p>

<table cellspacing="0" cellpadding="0" style="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
<tr style="text-align: center; vertical-align: bottom">
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; text-align: justify; margin-top: 0pt; margin-right: 0; margin-bottom: 0pt">Indicate by check mark whether the registrant is an emerging growth
company as defined in Rule 405 of the Securities Act of 1933 (&#167;230.405 of this chapter) or Rule 12b-2 of the Securities Exchange
Act of 1934 (&#167;240.12b-2 of this chapter).</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; text-align: left; margin-top: 0pt; margin-right: 0; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif">Emerging growth company </span><span style="font-family: Wingdings"><span id="xdx_904_edei--EntityEmergingGrowthCompany_c20250303__20250303_zWKQ6BUy7XGc"><ix:nonNumeric contextRef="AsOf2025-03-03" format="ixt:booleanfalse" id="Fact000028" name="dei:EntityEmergingGrowthCompany">&#168;</ix:nonNumeric></span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; text-align: justify; margin-top: 0pt; margin-right: 0; margin-bottom: 0pt"><span style="font-family: Times New Roman, Times, Serif">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 13(a) of the Exchange Act. <span style="font-family: Wingdings">&#168;</span><span style="font-family: Wingdings"></span></span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></p>

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<td style="width: 12%"><b>Item 2.02</b></td><td style="text-align: justify; width: 85%"><b>Results of Operations and Financial Condition.</b></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; background-color: white">On March&#160;3, 2025,
Mersana Therapeutics,&#160;Inc. (the &#8220;Company&#8221;) issued a press release announcing business updates and financial results for
the fiscal quarter and year ended December&#160;31, 2024. A copy of the press release is being furnished as Exhibit&#160;99.1 to this
Current Report on Form&#160;8-K.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; background-color: white">The information furnished
in this Item 2.02, including Exhibit&#160;99.1, shall not be deemed &#8220;filed&#8221; for purposes of Section&#160;18 of the Securities
Exchange Act of 1934, as amended (the &#8220;Exchange Act&#8221;), or otherwise subject to the liabilities of that section, nor shall
such information be deemed incorporated by reference in any filing by the Company with the Securities and Exchange Commission (the &#8220;SEC&#8221;)
under the Securities Act of 1933, as amended (the &#8220;Securities Act&#8221;), or the Exchange Act, regardless of any general incorporation
language contained in such filing, except as expressly set forth by specific reference in such a filing.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

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    <td style="width: 12%; font-size: 10pt"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Item 7.01</b></span></td>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; background-color: white">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; background-color: white">On March&#160;3, 2025,
the Company posted an updated corporate presentation on the Company&#8217;s website.&#160;<span style="background-color: white">To access
the presentation, investors should visit the &#8220;Events&#160;&amp; Presentations&#8221; page&#160;under the &#8220;Investors&#160;&amp;
Media&#8221; section of the Company&#8217;s website at ir.mersana.com.</span></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; background-color: white">The information furnished
under this Item 7.01 shall not be deemed &#8220;filed&#8221; for purposes of Section&#160;18 of the Exchange Act, or otherwise subject
to the liabilities of that section, nor shall such information be deemed incorporated by reference in any filing by the Company with the
SEC under the Securities Act or the Exchange Act, regardless of any general incorporation language contained in such filing, except as
expressly set forth by specific reference in such a filing.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

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<td style="width: 12%"><b>Item&#160;9.01.</b></td><td style="width: 85%"><b>Financial Statements and Exhibits.</b></td></tr></table>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(d)&#160;Exhibits</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

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    <td style="border-bottom: black 1pt solid; width: 88%"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt"><b>Description</b></span></td></tr>
  <tr style="vertical-align: bottom">
    <td><a href="tm257967d1_ex99-1.htm"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">99.1</span></a></td>
    <td>&#160;</td>
    <td><a href="tm257967d1_ex99-1.htm"><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Press Release issued by the Company on March&#160;3, 2025.</span></a></td></tr>
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    <td><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">104</span></td>
    <td>&#160;</td>
    <td><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cover Page&#160;Interactive Data File (embedded within the Inline XBRL document).</span></td></tr>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><b>&#160;</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><b></b></p>

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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><b>&#160;</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><b>SIGNATURES</b></p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">Pursuant to the requirements of the Securities Exchange Act of 1934,
the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&#160;</p>

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    <td colspan="2"><span style="font-size: 10pt"><b>MERSANA THERAPEUTICS,&#160;INC.</b></span></td></tr>
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    <td style="width: 50%"><span style="font-size: 10pt">&#160;</span></td>
    <td style="width: 3%"><span style="font-size: 10pt">&#160;</span></td>
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    <td><span style="font-family: Times New Roman, Times, Serif; font-size: 10pt">Date: March&#160;3, 2025</span></td>
    <td style="vertical-align: bottom"><span style="font-size: 10pt">By:</span></td>
    <td style="border-bottom: black 1pt solid; vertical-align: bottom"><span style="font-size: 10pt">/s/ Brian DeSchuytner</span></td></tr>
  <tr style="vertical-align: bottom">
    <td><span style="font-size: 10pt">&#160;</span></td>
    <td><span style="font-size: 10pt">&#160;</span></td>
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    <td><span style="font-size: 10pt">&#160;</span></td>
    <td><span style="font-size: 10pt">&#160;</span></td>
    <td><span style="font-size: 10pt">Senior Vice President, Chief Operating Officer and Chief Financial Officer</span></td></tr>
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<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&#160;</p>

<p style="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></p>

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<P STYLE="text-align: right; margin: 0"><B>Exhibit 99.1</B></P>

<P STYLE="margin: 0; text-align: right">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Mersana Therapeutics Provides Business Update
and Announces<BR>
Fourth Quarter and Full Year 2024 Financial Results</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></FONT></TD><TD><I>Announced positive initial Phase 1 clinical data and an additional Fast Track designation for Emi-Le</I></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></FONT></TD><TD><I>Initiated first expansion cohort in patients with triple-negative breast cancer (TNBC) previously treated with at least one topoisomerase-1
inhibitor (topo-1) ADC</I></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></FONT></TD><TD><I>Plan to present additional clinical data from dose escalation and backfill cohorts in 2025</I></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></FONT></TD><TD STYLE="text-align: justify"><I>Conference call today at 8:00 a.m.&nbsp;ET</I></TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>CAMBRIDGE,
Mass., March&nbsp;3, 2025</B></FONT> &ndash; Mersana Therapeutics,&nbsp;Inc. (NASDAQ: MRSN), a clinical-stage biopharmaceutical company
focused on discovering and developing a pipeline of antibody-drug conjugates (ADCs) targeting cancers in areas of high unmet medical need,
today provided a business update and reported financial results for the fourth quarter and full year ended December&nbsp;31, 2024.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&ldquo;We made significant progress advancing the clinical development
of Emi-Le in 2024,&rdquo; said Martin Huber, M.D., President and Chief Executive Officer of Mersana Therapeutics. &ldquo;These efforts
enabled us to begin 2025 by announcing positive initial Phase 1 clinical data, the initiation of expansion and a Fast Track designation
for HER2-negative breast cancer patients who have previously been treated with at least one topo-1 ADC. With promising monotherapy activity
reported in patients across multiple tumors, including those with heavily pretreated triple-negative breast cancer, as well as a differentiated
tolerability profile that may enable combination approaches, we believe Emi-Le offers us unique development opportunities that are unavailable
to other B7-H4 ADCs.&rdquo;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><U>Emiltatug Ledadotin (Emi-Le; XMT-1660)</U></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">In January&nbsp;2025, Mersana announced positive initial Phase 1 clinical
data for Emi-Le, the company&rsquo;s lead Dolasynthen ADC candidate targeting B7-H4, from 130 patients who were enrolled in dose escalation
and backfill cohorts as of a December&nbsp;13, 2024 data cutoff. The company also announced that Emi-Le had received a second Fast Track
designation from the U.S. Food and Drug Administration (FDA).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">The expansion portion of the company&rsquo;s Phase 1 clinical trial
continues at a dose of 67.4 mg/m<SUP>2</SUP> administered every four weeks in patients with TNBC who had received one to four prior lines
of therapy, including at least one topo-1 ADC. In parallel, the company continues to explore higher doses in dose escalation and backfill
cohorts to identify a second dose for expansion.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">In 2025, Mersana plans to initiate expansion enrollment at a second
dose in patients with TNBC who have received one to four prior lines of treatment, including at least one prior topo-1 ADC. The company
also plans to present additional Phase 1 clinical data from dose escalation and backfill cohorts in 2025.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><U>XMT-2056</U></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Mersana has continued to advance the dose escalation portion of its
Phase 1 clinical trial of XMT-2056, the company's lead Immunosynthen ADC candidate targeting a novel HER2 epitope. GSK plc has an exclusive
global license option to co-develop and commercialize XMT-2056.&nbsp;Mersana plans to continue enrolling patients in dose escalation and
expects to present initial clinical pharmacodynamic STING activation data for XMT-2056 in 2025.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><U>Collaborations</U></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Mersana continues to advance its collaborations with both Johnson&nbsp;&amp;
Johnson (Dolasynthen research collaboration) and Merck KGaA, Darmstadt, Germany (Immunosynthen research collaboration).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><U>Fourth Quarter 2024 Financial Results</U></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD><TD>Cash,
                                            cash equivalents and marketable securities as of December&nbsp;31, 2024 were $134.6 million.
                                            Mersana continues to expect that its capital resources will be sufficient to support its
                                            current operating plan commitments into 2026.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD><TD>Net
                                            cash used in operating activities for the fourth quarter of 2024 was $19.3 million.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD><TD>Collaboration
                                            revenue for the fourth quarter of 2024 was $16.4 million, compared to $10.7 million for the
                                            same period in 2023. The year-over-year change was primarily related to increased collaboration
                                            revenue recognized under Mersana&rsquo;s collaboration and license agreements with Johnson&nbsp;&amp;
                                            Johnson, Merck KGaA, Darmstadt, Germany and GSK.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD><TD>Research
                                            and development (R&amp;D) expenses for the fourth quarter of 2024 were $22.3 million, compared
                                            to $21.5 million for the same period in 2023. Included in the fourth quarter of 2024 R&amp;D
                                            expenses were $1.7 million in non-cash stock-based compensation expenses. The year-over-year
                                            increase in R&amp;D expenses was primarily related to increased costs associated with manufacturing
                                            and clinical development activities for Emi-Le and XMT-2056, primarily offset by reduced
                                            costs related to clinical development activities for UpRi, a discontinued ADC candidate.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD><TD>General
                                            and administrative (G&amp;A) expenses for the fourth quarter of 2024 were $8.9 million, compared
                                            to $10.1 million during the same period in 2023. Included in the fourth quarter of 2024 G&amp;A
                                            expenses were $1.7 million in non-cash stock-based compensation expenses. The year-over-year
                                            decline in G&amp;A expenses was primarily related to reduced employee compensation expense
                                            following the company&rsquo;s 2023 restructuring and reduced consulting and professional
                                            services fees.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD><TD>Net
                                            loss for the fourth quarter of 2024 was $14.1 million, or $0.11 per share, compared to a
                                            net loss of $19.5 million, or $0.16 per share, for the same period in 2023.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><U>Full Year 2024 Financial Results</U></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><FONT STYLE="font-family: Symbol">&middot;</FONT></FONT></TD><TD>Net cash used in operating activities for full year 2024 was $82.3 million.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD><TD>Collaboration
                                            revenue for full year 2024 was $40.5 million, compared to $36.9 million for 2023. The year-over-year
                                            increase was primarily related to incremental milestone payments associated with the company&rsquo;s
                                            Johnson and Johnson collaboration and license agreement.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD><TD>R&amp;D
                                            expenses for full year 2024 were $73.0 million, compared to $148.3 million for the full year
                                            2023. Included in 2024 R&amp;D expenses were $8.9 million in non-cash stock-based compensation
                                            expenses. The decline in R&amp;D expenses was primarily related to reduced costs associated
                                            with manufacturing and clinical development activities for UpRi, reduced employee compensation
                                            expenses following the company&rsquo;s restructuring in 2023, and reduced consulting and
                                            professional services fees, partially offset by increased costs for clinical development
                                            activities for Emi-Le.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD><TD>G&amp;A
                                            expenses for full year 2024 were $40.8 million, compared to $59.5 million for the full year
                                            2023. Included in 2024 G&amp;A expenses were $7.6 million in non-cash stock-based compensation
                                            expenses. The year-over-year decline in G&amp;A expenses was primarily related to reduced
                                            consulting and professional services fees and reduced employee compensation expense following
                                            the aforementioned restructuring.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD><TD>Net
                                            loss for full year 2024 was $69.2 million, or $0.56 per share, compared to a net loss of
                                            $171.7 million, or $1.48 per share, for the full year 2023.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><U>Conference Call Reminder</U></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Mersana will host a conference call today at 8:00 a.m.&nbsp;ET to discuss
business updates and its financial results for the fourth quarter and full year of 2024. To access the call, please dial 833-255-2826
(domestic) or 412-317-0689 (international). A live webcast of the presentation will be available on the Investors&nbsp;&amp; Media section
of the Mersana website at www.mersana.com, and a replay of the webcast will be available in the same location following the conference
call for approximately 90 days.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><U>About Mersana Therapeutics</U></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt; background-color: white">Mersana
Therapeutics is a clinical-stage biopharmaceutical company focused on the development of novel antibody-drug conjugates (ADCs) and driven
by the knowledge that patients are waiting for new treatment options. The company has developed proprietary cytotoxic (Dolasynthen) and
immunostimulatory (Immunosynthen) ADC platforms that are generating a pipeline of wholly-owned and partnered product candidates with
the potential to treat a range of cancers. Its pipeline includes Emi-Le (emiltatug ledadotin; XMT-1660), a Dolasynthen ADC targeting
B7-H4, and XMT-2056, an Immunosynthen ADC targeting a novel epitope of human epidermal growth factor receptor 2 (HER2). Mersana routinely
posts information that may be useful to investors on the &ldquo;Investors&nbsp;&amp; Media&rdquo; section of its website at&nbsp;</FONT><FONT STYLE="background-color: white"><U>www.mersana.com</U>.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B><U>Forward-Looking Statements</U></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="background-color: white">This press release contains &ldquo;forward-looking&rdquo;
statements and information within the meaning of the Private Securities Litigation Reform Act of 1995. These statements may be identified
by words such as &ldquo;aims,&rdquo; &ldquo;anticipates,&rdquo; &ldquo;believes,&rdquo; &ldquo;could,&rdquo; &ldquo;estimates,&rdquo;
 &ldquo;expects,&rdquo; &ldquo;forecasts,&rdquo; &ldquo;goal,&rdquo; &ldquo;intends,&rdquo; &ldquo;may,&rdquo; &ldquo;plans,&rdquo; &ldquo;possible,&rdquo;
 &ldquo;potential,&rdquo; &ldquo;seeks,&rdquo; &ldquo;will&rdquo; and variations of these words or similar expressions, although not all
forward-looking statements contain these words. Forward-looking statements in this press release include, but are not limited to, statements
concerning Mersana&rsquo;s plans regarding the clinical development of Emi-Le and XMT-2056, including with respect to the progress and
design of the clinical trials of these product candidates; the potential clinical benefits of Emi-Le; Mersana&rsquo;s efforts to identify
an additional dose for investigation in the expansion portion of its Phase 1 clinical trial of Emi-Le; Mersana&rsquo;s planned data presentations,
including with respect to its Phase 1 clinical trial of Emi-Le and to clinical pharmacodynamic STING activation data related to XMT-2056;
Mersana&rsquo;s collaborations with third parties; the development and potential of Mersana&rsquo;s product candidates, platforms, technology
and pipeline of ADC candidates; and Mersana&rsquo;s expected cash runway. Mersana may not actually achieve the plans, intentions or expectations
disclosed in these forward-looking statements, and you should not place undue reliance on these forward-looking statements. Actual results
or events could differ materially from the plans, intentions and expectations disclosed in these forward-looking statements as a result
of various factors, including, among other things, uncertainties inherent in research and development, in the advancement, progression
and completion of clinical trials and in the clinical development of Mersana&rsquo;s product candidates, including Emi-Le and XMT-2056;
the risk that Mersana may face delays in patient enrollment in its Phase 1 clinical trials of Emi-Le and XMT-2056; the risk that outcomes
of preclinical studies may not be predictive of clinical trial results; the risk that initial or interim results from a clinical trial
may not be predictive of the final results of the trial or the results of future trials; the risk that clinical trial data may not support
regulatory applications or approvals; the risk that Mersana may not realize the intended benefits of its platforms, technology and collaborations;
the risk that Mersana's projections regarding its expected cash runway are inaccurate or that the conduct of its business requires more
cash than anticipated; and other important factors, any of which could cause Mersana&rsquo;s actual results to differ from those contained
in the forward-looking statements, that are described in greater detail in the section entitled &ldquo;Risk Factors&rdquo; in Mersana&rsquo;s
Quarterly Report on Form&nbsp;10-Q filed with the Securities and Exchange Commission (&ldquo;SEC&rdquo;) on November&nbsp;13, 2024, as
well as in other filings Mersana may make with the SEC in the future. Any forward-looking statements contained in this press release speak
only as of the date hereof, and Mersana expressly disclaims any obligation to update any forward-looking statements contained herein,
whether because of any new information, future events, changed circumstances or otherwise, except as otherwise required by law.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Mersana Therapeutics,&nbsp;Inc.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Selected Condensed Consolidated Balance Sheet
Data</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(in
thousands and </B></FONT><B>unaudited)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font: bold 10pt Times New Roman, Times, Serif; text-align: center">December&nbsp;31,</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font: bold 10pt Times New Roman, Times, Serif; text-align: center">December&nbsp;31,</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center">2024</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center">2023</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 74%; text-align: left">Cash, cash equivalents and marketable securities</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 10%; text-align: right">134,620</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 10%; text-align: right">209,084</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Working capital<SUP>(1)</SUP></FONT></TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">74,446</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">150,420</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">Total assets</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">144,663</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">226,060</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">Total stockholders' (deficit) equity</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">(9,509</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">)</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">36,904</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD></TR>
  </TABLE>


<P STYLE="margin: 0">&nbsp;&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><SUP>(1)</SUP></FONT>&nbsp;The company defines working capital as current assets less current liabilities.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Mersana Therapeutics,&nbsp;Inc.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Condensed Consolidated Statement of Operations</B></P>

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>(in
thousands, except share and per share data, and </B></FONT><B>unaudited)</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="border-collapse: collapse; width: 100%; font: 10pt Times New Roman, Times, Serif">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center">Three months ended</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD COLSPAN="6" STYLE="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center">Twelve months ended</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font: bold 10pt Times New Roman, Times, Serif; text-align: center">December&nbsp;31,</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font: bold 10pt Times New Roman, Times, Serif; text-align: center">December&nbsp;31,</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font: bold 10pt Times New Roman, Times, Serif; text-align: center">December&nbsp;31,</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font: bold 10pt Times New Roman, Times, Serif; text-align: center">December&nbsp;31,</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font-size: 10pt">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center">2024</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center">2023</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center">2024</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="border-bottom: Black 1pt solid; font: bold 10pt Times New Roman, Times, Serif; text-align: center">2023</TD><TD STYLE="font: bold 10pt Times New Roman, Times, Serif">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 48%; text-align: left">Collaboration revenue</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 10%; text-align: right">16,361</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 10%; text-align: right">10,701</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 10%; text-align: right">40,497</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left">$</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 10%; text-align: right">36,855</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; width: 1%; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">Operating expenses:</TD><TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: right">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD><TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: right">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD><TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: right">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD><TD STYLE="font-size: 10pt">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: right">&nbsp;</TD><TD STYLE="font-size: 10pt; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">Research and development</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">22,286</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">21,495</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">73,020</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">148,269</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">General and administrative</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">8,886</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">10,134</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">40,813</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">59,543</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">Restructuring expenses</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">-</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">499</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">-</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">8,713</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">Total operating expenses</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">31,172</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">32,128</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">113,833</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: right">216,525</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">Total other income, net</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">694</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">1,883</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">4,562</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">8,000</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">Loss before income taxes</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">(14,117</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">)</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">(19,544</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">)</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">(68,774</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">)</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">(171,670</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">)</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">Income tax expense</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">-</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">-</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">(418</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">)</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">-</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">Net loss</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">(14,117</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">)</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">(19,544</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">)</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">(69,192</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">)</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">(171,670</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">)</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: rgb(204,238,255)">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">Net loss per share &mdash; basic and diluted</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">(0.11</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">)</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">(0.16</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">)</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">(0.56</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">)</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: left">$</TD><TD STYLE="border-bottom: Black 1pt solid; font: 10pt Times New Roman, Times, Serif; text-align: right">(1.48</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">)</TD></TR>
  <TR STYLE="vertical-align: bottom; background-color: White">
    <TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">Weighted-average number of common shares &mdash; basic and diluted</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right">123,558,203</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right">120,614,350</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right">122,539,598</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD><TD STYLE="border-bottom: Black 2.5pt double; font: 10pt Times New Roman, Times, Serif; text-align: right">116,112,891</TD><TD STYLE="font: 10pt Times New Roman, Times, Serif; text-align: left">&nbsp;</TD></TR>
  </TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>###</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Contact:</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Jason Fredette</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">617-498-0020</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><U>jason.fredette@mersana.com</U></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<TYPE>EX-101.SCH
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<DESCRIPTION>XBRL TAXONOMY EXTENSION SCHEMA
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<XBRL>
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<FILENAME>mrsn-20250303_lab.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE
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<XBRL>
<?xml version="1.0" encoding="US-ASCII" standalone="no"?>
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<link:linkbase xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xbrli="http://www.xbrl.org/2003/instance" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
    <link:roleRef xlink:type="simple" xlink:href="http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd#negatedLabel" roleURI="http://www.xbrl.org/2009/role/negatedLabel" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AmendmentFlag" xlink:to="dei_AmendmentFlag_lbl" xlink:type="arc" />
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_AmendmentDescription" xlink:label="dei_AmendmentDescription" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AmendmentDescription" xlink:to="dei_AmendmentDescription_lbl" xlink:type="arc" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentAnnualReport_lbl" xml:lang="en-US">Document Annual Report</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentQuarterlyReport_lbl" xml:lang="en-US">Document Quarterly Report</link:label>
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      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentShellCompanyReport" xlink:label="dei_DocumentShellCompanyReport" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentShellCompanyEventDate" xlink:to="dei_DocumentShellCompanyEventDate_lbl" xlink:type="arc" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodStartDate" xlink:to="dei_DocumentPeriodStartDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentPeriodStartDate_lbl" xml:lang="en-US">Document Period Start Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_DocumentPeriodEndDate" xlink:label="dei_DocumentPeriodEndDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentPeriodEndDate" xlink:to="dei_DocumentPeriodEndDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentPeriodEndDate_lbl" xml:lang="en-US">Document Period End Date</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_DocumentFiscalPeriodFocus" xlink:to="dei_DocumentFiscalPeriodFocus_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalPeriodFocus_lbl" xml:lang="en-US">Document Fiscal Period Focus</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_DocumentFiscalYearFocus_lbl" xml:lang="en-US">Document Fiscal Year Focus</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_CurrentFiscalYearEndDate" xlink:label="dei_CurrentFiscalYearEndDate" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CurrentFiscalYearEndDate" xlink:to="dei_CurrentFiscalYearEndDate_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CurrentFiscalYearEndDate_lbl" xml:lang="en-US">Current Fiscal Year End Date</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityFileNumber" xlink:label="dei_EntityFileNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityFileNumber" xlink:to="dei_EntityFileNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityFileNumber_lbl" xml:lang="en-US">Entity File Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityRegistrantName" xlink:label="dei_EntityRegistrantName" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityRegistrantName" xlink:to="dei_EntityRegistrantName_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityRegistrantName_lbl" xml:lang="en-US">Entity Registrant Name</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityCentralIndexKey" xlink:to="dei_EntityCentralIndexKey_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityCentralIndexKey_lbl" xml:lang="en-US">Entity Central Index Key</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityPrimarySicNumber" xlink:label="dei_EntityPrimarySicNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityPrimarySicNumber" xlink:to="dei_EntityPrimarySicNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityPrimarySicNumber_lbl" xml:lang="en-US">Entity Primary SIC Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityTaxIdentificationNumber" xlink:label="dei_EntityTaxIdentificationNumber" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityTaxIdentificationNumber" xlink:to="dei_EntityTaxIdentificationNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityTaxIdentificationNumber_lbl" xml:lang="en-US">Entity Tax Identification Number</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityIncorporationStateCountryCode" xlink:label="dei_EntityIncorporationStateCountryCode" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityIncorporationStateCountryCode" xlink:to="dei_EntityIncorporationStateCountryCode_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityIncorporationStateCountryCode_lbl" xml:lang="en-US">Entity Incorporation, State or Country Code</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressAddressLine1" xlink:label="dei_EntityAddressAddressLine1" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine1" xlink:to="dei_EntityAddressAddressLine1_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressAddressLine1_lbl" xml:lang="en-US">Entity Address, Address Line One</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine2" xlink:to="dei_EntityAddressAddressLine2_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressAddressLine2_lbl" xml:lang="en-US">Entity Address, Address Line Two</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressAddressLine3" xlink:label="dei_EntityAddressAddressLine3" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_EntityAddressAddressLine3" xlink:to="dei_EntityAddressAddressLine3_lbl" xlink:type="arc" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressCityOrTown_lbl" xml:lang="en-US">Entity Address, City or Town</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressStateOrProvince" xlink:label="dei_EntityAddressStateOrProvince" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressStateOrProvince_lbl" xml:lang="en-US">Entity Address, State or Province</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_EntityAddressCountry_lbl" xml:lang="en-US">Entity Address, Country</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityAddressPostalZipCode" xlink:label="dei_EntityAddressPostalZipCode" />
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_CountryRegion" xlink:to="dei_CountryRegion_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CountryRegion_lbl" xml:lang="en-US">Country Region</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_CityAreaCode_lbl" xml:lang="en-US">City Area Code</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_LocalPhoneNumber" xlink:to="dei_LocalPhoneNumber_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_LocalPhoneNumber_lbl" xml:lang="en-US">Local Phone Number</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_Extension_lbl" xml:lang="en-US">Extension</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_WrittenCommunications" xlink:to="dei_WrittenCommunications_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_WrittenCommunications_lbl" xml:lang="en-US">Written Communications</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_SolicitingMaterial" xlink:label="dei_SolicitingMaterial" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_SolicitingMaterial" xlink:to="dei_SolicitingMaterial_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_SolicitingMaterial_lbl" xml:lang="en-US">Soliciting Material</link:label>
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_PreCommencementTenderOffer_lbl" xml:lang="en-US">Pre-commencement Tender Offer</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_PreCommencementIssuerTenderOffer" xlink:label="dei_PreCommencementIssuerTenderOffer" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_PreCommencementIssuerTenderOffer" xlink:to="dei_PreCommencementIssuerTenderOffer_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_PreCommencementIssuerTenderOffer_lbl" xml:lang="en-US">Pre-commencement Issuer Tender Offer</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_Security12bTitle" xlink:label="dei_Security12bTitle" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_Security12bTitle" xlink:to="dei_Security12bTitle_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_Security12bTitle_lbl" xml:lang="en-US">Title of 12(b) Security</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_NoTradingSymbolFlag" xlink:label="dei_NoTradingSymbolFlag" />
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      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_NoTradingSymbolFlag_lbl" xml:lang="en-US">No Trading Symbol Flag</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_TradingSymbol" xlink:label="dei_TradingSymbol" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_TradingSymbol" xlink:to="dei_TradingSymbol_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_TradingSymbol_lbl" xml:lang="en-US">Trading Symbol</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_SecurityExchangeName" xlink:label="dei_SecurityExchangeName" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_SecurityExchangeName" xlink:to="dei_SecurityExchangeName_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_SecurityExchangeName_lbl" xml:lang="en-US">Security Exchange Name</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_Security12gTitle" xlink:label="dei_Security12gTitle" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_Security12gTitle" xlink:to="dei_Security12gTitle_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_Security12gTitle_lbl" xml:lang="en-US">Title of 12(g) Security</link:label>
      <link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_SecurityReportingObligation" xlink:label="dei_SecurityReportingObligation" />
      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_SecurityReportingObligation" xlink:to="dei_SecurityReportingObligation_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_SecurityReportingObligation_lbl" xml:lang="en-US">Security Reporting Obligation</link:label>
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      <link:labelArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="dei_AnnualInformationForm" xlink:to="dei_AnnualInformationForm_lbl" xlink:type="arc" />
      <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="dei_AnnualInformationForm_lbl" xml:lang="en-US">Annual Information Form</link:label>
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</DOCUMENT>
<DOCUMENT>
<TYPE>EX-101.PRE
<SEQUENCE>5
<FILENAME>mrsn-20250303_pre.xml
<DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE
<TEXT>
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<DOCUMENT>
<TYPE>XML
<SEQUENCE>7
<FILENAME>R1.htm
<DESCRIPTION>IDEA: XBRL DOCUMENT
<TEXT>
<html>
<head>
<title></title>
<link rel="stylesheet" type="text/css" href="include/report.css">
<script type="text/javascript" src="Show.js">/* Do Not Remove This Comment */</script><script type="text/javascript">
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<span style="display: none;">v3.25.0.1</span><table class="report" border="0" cellspacing="2" id="idm46081827059312">
<tr>
<th class="tl" colspan="1" rowspan="1"><div style="width: 200px;"><strong>Cover<br></strong></div></th>
<th class="th"><div>Mar. 03, 2025</div></th>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_CoverAbstract', window );"><strong>Cover [Abstract]</strong></a></td>
<td class="text">&#160;<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_DocumentType', window );">Document Type</a></td>
<td class="text">8-K<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_AmendmentFlag', window );">Amendment Flag</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_DocumentPeriodEndDate', window );">Document Period End Date</a></td>
<td class="text">Mar.  03,  2025<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityFileNumber', window );">Entity File Number</a></td>
<td class="text">001-38129<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityRegistrantName', window );">Entity Registrant Name</a></td>
<td class="text">MERSANA THERAPEUTICS, INC.<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityCentralIndexKey', window );">Entity Central Index Key</a></td>
<td class="text">0001442836<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityTaxIdentificationNumber', window );">Entity Tax Identification Number</a></td>
<td class="text">04-3562403<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityIncorporationStateCountryCode', window );">Entity Incorporation, State or Country Code</a></td>
<td class="text">DE<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityAddressAddressLine1', window );">Entity Address, Address Line One</a></td>
<td class="text">840
Memorial Drive<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityAddressCityOrTown', window );">Entity Address, City or Town</a></td>
<td class="text">Cambridge<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityAddressStateOrProvince', window );">Entity Address, State or Province</a></td>
<td class="text">MA<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityAddressPostalZipCode', window );">Entity Address, Postal Zip Code</a></td>
<td class="text">02139<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_CityAreaCode', window );">City Area Code</a></td>
<td class="text">617<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_LocalPhoneNumber', window );">Local Phone Number</a></td>
<td class="text">498-0020<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_WrittenCommunications', window );">Written Communications</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_SolicitingMaterial', window );">Soliciting Material</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_PreCommencementTenderOffer', window );">Pre-commencement Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_PreCommencementIssuerTenderOffer', window );">Pre-commencement Issuer Tender Offer</a></td>
<td class="text">false<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_Security12bTitle', window );">Title of 12(b) Security</a></td>
<td class="text">Common Stock, $0.0001 par value<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_TradingSymbol', window );">Trading Symbol</a></td>
<td class="text">MRSN<span></span>
</td>
</tr>
<tr class="ro">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_SecurityExchangeName', window );">Security Exchange Name</a></td>
<td class="text">NASDAQ<span></span>
</td>
</tr>
<tr class="re">
<td class="pl" style="border-bottom: 0px;" valign="top"><a class="a" href="javascript:void(0);" onclick="Show.showAR( this, 'defref_dei_EntityEmergingGrowthCompany', window );">Entity Emerging Growth Company</a></td>
<td class="text">false<span></span>
</td>
</tr>
</table>
<div style="display: none;">
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_AmendmentFlag">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_AmendmentFlag</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
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<td><strong> Period Type:</strong></td>
<td>duration</td>
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</table></div>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_CityAreaCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Area code of city</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_CityAreaCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
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<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
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<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
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<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_CoverAbstract">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Cover page.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_CoverAbstract</td>
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<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
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<td><strong> Data Type:</strong></td>
<td>xbrli:stringItemType</td>
</tr>
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<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
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<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentPeriodEndDate">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period.  The format of the date is YYYY-MM-DD.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentPeriodEndDate</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:dateItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_DocumentType">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_DocumentType</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:submissionTypeItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressAddressLine1">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Address Line 1 such as Attn, Building Name, Street Name</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressAddressLine1</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressCityOrTown">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Name of the City or Town</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressCityOrTown</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressPostalZipCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Code for the postal or zip code</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressPostalZipCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityAddressStateOrProvince">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Name of the state or province.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityAddressStateOrProvince</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:stateOrProvinceItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityCentralIndexKey">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityCentralIndexKey</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:centralIndexKeyItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityEmergingGrowthCompany">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Indicate if registrant meets the emerging growth company criteria.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityEmergingGrowthCompany</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityFileNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityFileNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:fileNumberItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityIncorporationStateCountryCode">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Two-character EDGAR code representing the state or country of incorporation.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityIncorporationStateCountryCode</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:edgarStateCountryItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityRegistrantName">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityRegistrantName</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_EntityTaxIdentificationNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b-2<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_EntityTaxIdentificationNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:employerIdItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_LocalPhoneNumber">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Local phone number for entity.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_LocalPhoneNumber</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:normalizedStringItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementIssuerTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 13e<br> -Subsection 4c<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementIssuerTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_PreCommencementTenderOffer">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 14d<br> -Subsection 2b<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_PreCommencementTenderOffer</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>xbrli:booleanItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
<table border="0" cellpadding="0" cellspacing="0" class="authRefData" style="display: none;" id="defref_dei_Security12bTitle">
<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
<tr><td><div class="body" style="padding: 2px;">
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Title of a 12(b) registered security.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection b<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
<td><strong> Name:</strong></td>
<td style="white-space:nowrap;">dei_Security12bTitle</td>
</tr>
<tr>
<td style="padding-right: 4px;white-space:nowrap;"><strong> Namespace Prefix:</strong></td>
<td>dei_</td>
</tr>
<tr>
<td><strong> Data Type:</strong></td>
<td>dei:securityTitleItemType</td>
</tr>
<tr>
<td><strong> Balance Type:</strong></td>
<td>na</td>
</tr>
<tr>
<td><strong> Period Type:</strong></td>
<td>duration</td>
</tr>
</table></div>
</div></td></tr>
</table>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Name of the Exchange on which a security is registered.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Number 240<br> -Section 12<br> -Subsection d1-1<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<tr><td class="hide"><a style="color: white;" href="javascript:void(0);" onclick="Show.hideAR();">X</a></td></tr>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Exchange Act<br> -Section 14a<br> -Number 240<br> -Subsection 12<br></p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
<tr>
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<td style="white-space:nowrap;">dei_SolicitingMaterial</td>
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Trading symbol of an instrument as listed on an exchange.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>No definition available.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ Details</a><div style="display: none;"><table border="0" cellpadding="0" cellspacing="0">
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<a href="javascript:void(0);" onclick="Show.toggleNext( this );">- Definition</a><div><p>Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.</p></div>
<a href="javascript:void(0);" onclick="Show.toggleNext( this );">+ References</a><div style="display: none;"><p>Reference 1: http://www.xbrl.org/2003/role/presentationRef<br> -Publisher SEC<br> -Name Securities Act<br> -Number 230<br> -Section 425<br></p></div>
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