ImmunoGen Announces Webcast of Presentation at Deutsche Bank’s 43rd Annual Health Care Conference

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 present at the upcoming Deutsche Bank 43rd Annual Health Care Conference. The presentation is scheduled for 8:40am ET on May 9, 2018.

A webcast of the presentation will be accessible live through the “Investors” section of the Company’s website, www.immunogen.com; a replay will be available in the same location for approximately two weeks.

About ImmunoGen, Inc.ImmunoGen is a clinical-stage biotechnology company that develops targeted cancer therapeutics using its proprietary ADC technology. The Company’s lead product candidate, mirvetuximab soravtansine, is in the Phase 3 FORWARD I trial for FRα-positive platinum-resistant ovarian cancer, and is in the Phase 1b/2 FORWARD II trial in combination regimens for earlier-stage disease. ImmunoGen has three additional clinical-stage product candidates, two of which are being developed in collaboration with Jazz Pharmaceuticals. ImmunoGen's ADC technology is also used in Roche's marketed product, Kadcyla®, 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]