ImmunoGen Announces Webcasts of Presentations at Upcoming Conferences

ImmunoGen, Inc. (Nasdaq: IMGN), a leader in the expanding field of antibody-drug conjugates (ADCs) for the treatment of cancer, today announced that the following presentations by Company management at upcoming investor conferences will be webcast:

• Jefferies London Healthcare ConferenceNovember 14, 2018 at 9:40 am ET/2:40 pm GMT

• Evercore ISI HealthConXNovember 27, 2018 at 8:45 am ET

• 30th Annual Piper Jaffray Healthcare ConferenceNovember 28, 2018 at 11:30 am ET

A webcast of each 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 IMMUNOGENImmunoGen is developing the next generation of antibody-drug conjugates (ADCs) to improve outcomes for cancer patients. By generating targeted therapies with enhanced anti-tumor activity and favorable tolerability profiles, we aim to disrupt the progression of cancer and offer our patients more good days. We call this our commitment to “target a better now.” Our lead product candidate, mirvetuximab soravtansine, is in a Phase 3 study for folate receptor alpha (FRα)-positive platinum-resistant ovarian cancer, and in Phase 1b/2 testing in combination regimens. Our novel IGN candidates for hematologic malignancies, IMGN779 and IMGN632, are in Phase 1 studies.

Learn more about who we are, what we do, and how we do it at www.immunogen.com.

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INVESTOR RELATIONS CONTACTImmunoGen, Inc.Sarah Kiely, [e-mail] Strategic CommunicationsChelcie Lister, [e-mail] CONTACTImmunoGen, Inc.Courtney O’Konek, [e-mail] ConsultingRobert Stanislaro, [e-mail]