ImmunoGen, Inc. Announces Conference Call to Discuss its Third Quarter Fiscal Year 2016 Financial Results

ImmunoGen, Inc. (Nasdaq: IMGN), a biotechnology company that develops novel anticancer therapeutics using its antibody-drug conjugate (ADC) technology, today announced that the Company will host a conference call at 8:00 a.m. ET on Friday, April 29, 2016, to discuss ImmunoGen's financial results for the three-month period ended March 31, 2016. Management also will provide an update on mirvetuximab soravtansine and other ImmunoGen product programs.

To access the live call by phone, dial 913-312-0936; the conference ID is 7099318. The call also may be accessed through the Investors section of the Company's website, www.immunogen.com. Following the live webcast, a replay of the call will be available at the same location through May 13, 2016.

About ImmunoGen, Inc.

ImmunoGen is a clinical-stage biotechnology company that develops targeted anticancer therapeutics using its proprietary ADC technology. The Company’s lead product candidate, mirvetuximab soravtansine, is in Phase 2 testing for the treatment of folate receptor α-positive ovarian cancer. ImmunoGen’s ADC technology is used in Roche’s marketed product, Kadcyla®, and in programs in development by partners Amgen, Bayer, Biotest, CytomX, Lilly, Novartis, Sanofi and Takeda. More information about the Company can be found at www.immunogen.com.

Kadcyla® is a registered trademark of Genentech, a member of the Roche Group.

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For Investors & Media:ImmunoGen, Inc.Carol Hausner, [e-mail]