ImmunoGen Announces Conference Call to Discuss Its Second Quarter 2017 Financial Results

ImmunoGen, Inc. (Nasdaq: IMGN), a leader in the expanding field of antibody-drug conjugates (ADCs) for the treatment of cancer, today announced that the Company will host a conference call at 8:00 a.m. ET on Friday, July 28, 2017, to discuss its second quarter 2017 financial results. Management also will provide a brief update on the business.

To access the live call by phone, dial 719-325-4845; the conference ID is 8195001. 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 August 11, 2017.

About ImmunoGen, Inc.

ImmunoGen is a clinical-stage biotechnology company that develops targeted cancer therapeutics using its proprietary ADC technology. ImmunoGen's lead product candidate, mirvetuximab soravtansine, is in a Phase 3 trial for FRα-positive platinum-resistant ovarian cancer, and is in Phase 1b/2 testing in combination regimens for earlier-stage disease. ImmunoGen's ADC technology is used in Roche's marketed product, Kadcyla®, in other clinical-stage ImmunoGen product candidates, and in programs in development by Amgen, Bayer, Biotest, CytomX, Debiopharm, 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 InvestorsImmunoGen, Inc.Sarah Kiely, [e-mail] MediaImmunoGen, Inc.Courtney O’Konek, [e-mail] Consulting Inc.Robert Stanislaro, [e-mail]