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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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ACCESSION NUMBER:		9999999997-09-005355
CONFORMED SUBMISSION TYPE:	REGDEX
PUBLIC DOCUMENT COUNT:		1
ITEM INFORMATION:		Rule 506
FILED AS OF DATE:		20090223
DATE AS OF CHANGE:		20090303
EFFECTIVENESS DATE:		20090223

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MERSANA THERAPEUTICS INC
		CENTRAL INDEX KEY:			0001442836
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE

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

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		STREET 1:		840 MEMORIAL DRIVE
		CITY:			CAMBRIDGE
		STATE:			MA
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