ImmunoGen, Inc. Announces Canaccord Genuity Growth Conference Webcast

ImmunoGen, Inc. (Nasdaq: IMGN), a biotechnology company that develops novel anticancer therapeutics using its antibody-drug conjugate (ADC) technology, today announced the Company will participate in the Canaccord Genuity 35th Annual Growth Conference. ImmunoGen President and CEO Daniel Junius will discuss the Company in a “fireside chat” moderated question and answer session that will be webcast beginning at 1 pm ET on August 12, 2015.

This webcast will be accessible live through the "Investors" section of the Company's website, www.immunogen.com; a replay will be available at the same location for approximately a week.

About ImmunoGen, Inc.

ImmunoGen, Inc. develops targeted anticancer therapeutics. The Company’s ADC technology uses tumor-targeting antibodies to deliver an ImmunoGen cell-killing agent specifically to cancer cells. The Company utilizes its ADC technology with its antibodies to create ImmunoGen product candidates and also out-licenses limited rights to use its technology to other companies. Roche’s Kadcyla® is the first marketed product with ImmunoGen’s ADC technology. 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:ImmunoGen, Inc.Carol Hausner, [e-mail] Media:Pure Communications, Inc.Dan Budwick, 973-271-6085