ImmunoGen, Inc. Announces Webcast of Presentation at J.P. Morgan 29th Annual Healthcare Conference

ImmunoGen, Inc. (Nasdaq: IMGN), a biotechnology company that develops targeted antibody-based anticancer products using its antibody expertise and Targeted Antibody Payload (TAP) technology, today announced that President and CEO, Daniel Junius, will present at the J.P. Morgan 29th Annual Healthcare Conference at 9:00 am PT/12:00 noon ET on January 10, 2011. The presentation will contain an update on IMGN901 development plans, including current plans related to Merkel cell carcinoma.

A live webcast of the presentation can be accessed through the “Investor Information” section of the Company’s website, www.immunogen.com; a replay of the presentation will be available at the same location for two weeks.

About ImmunoGen, Inc.

ImmunoGen, Inc. develops targeted anticancer therapeutics using the Company's expertise in tumor biology, monoclonal antibodies and potent cancer-cell killing agents. The Company's TAP technology uses monoclonal antibodies to deliver one of ImmunoGen's proprietary cancer-cell killing agents specifically to tumor cells. There are currently seven TAP compounds in the clinic, with a wealth of clinical data reported with the technology. ImmunoGen’s collaborative partners include Amgen, Bayer Schering Pharma, Biogen Idec, Biotest, Genentech (a member of the Roche Group), Novartis, and sanofi-aventis. The most advanced compound using ImmunoGen's TAP technology, trastuzumab-DM1 (T-DM1), is in Phase III testing through the Company's collaboration with Genentech. More information about ImmunoGen can be found at www.immunogen.com.