Infinity Pharmaceuticals (INFIQ) 10-Q 2011 Q3 Quarterly report

Exhibit 32.1

STATEMENT PURSUANT TO 18 U.S.C. §1350, AS ADOPTED

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to 18 U.S.C. §1350, the undersigned certifies that this Quarterly Report on Form 10-Q for the period ended September 30, 2011 fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 and that the information contained in this report fairly presents, in all material respects, the financial condition and results of operations of Infinity Pharmaceuticals, Inc.

Date: November 8, 2011	/s/    Adelene Q. Perkins
	Adelene Q. Perkins
	President and Chief Executive Officer
	(Principal Executive and Principal Financial Officer)

A signed original of this written statement required by Section 906 has been provided to Infinity Pharmaceuticals, Inc. and will be retained by Infinity Pharmaceuticals, Inc. and furnished to the Securities and Exchange Commission or its staff upon request.