News

November 29, 2007
ImmunoGen, Inc. to Host Conference Call to Review Clinical Findings Reported at ASH

CAMBRIDGE, Mass.--(BUSINESS WIRE)--Nov. 29, 2007--ImmunoGen, Inc. (Nasdaq: IMGN) today announced that the Company will host a conference call at 10:00 am ET on Tuesday, December 11, 2007 to discuss the clinical findings reported by the Company at the American Society of Hematology (ASH) 49th Annual Meeting and Exposition. The call can be accessed live by dialing 913-312-9321; no passcode is required. The call also will be webcast live and can be accessed through the "Investor Relations" section of the ImmunoGen website, www.immunogen.com. An archive of the webcast will be available at the same location until December 21, 2007.

About ImmunoGen, Inc.

ImmunoGen, Inc. develops targeted anticancer biopharmaceuticals. The Company's proprietary Tumor-Activated Prodrug (TAP) technology uses tumor-targeting antibodies to deliver a potent cell-killing agent specifically to cancer cells. Two TAP compounds wholly owned by ImmunoGen are in clinical testing - IMGN901 (huN901-DM1) and IMGN242 (huC242-DM4). Three TAP compounds are in clinical testing through ImmunoGen's collaborations with other companies - AVE9633 and SAR3419, in development by sanofi-aventis, and T-DM1 (trastuzumab-DM1), in development by Genentech. Additionally, the naked antibody compound, AVE1642, is in development through the Company's collaboration with sanofi-aventis. Multiple compounds are in research/preclinical development through ImmunoGen's collaborations and internal programs.

CONTACT:
Investors
ImmunoGen, Inc.
Carol Hausner, 617-995-2500
Executive Director, Investor Relations and Corporate Communications
info@immunogen.com

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