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ImmunoGen, Inc. Announces Positive Trastuzumab-DM1 Clinical Data Reported at the San Antonio Breast Cancer Symposium

WALTHAM, MA, December 12, 2009 – ImmunoGen, Inc. (Nasdaq: IMGN), a biopharmaceutical company that develops targeted anticancer therapeutics, today announced the presentation of positive trastuzumab-DM1 (T-DM1) clinical data at the 32nd Annual San Antonio Breast Cancer Symposium (Abstract #710). T-DM1 comprises ImmunoGen’s DM1 cancer-cell killing agent linked to the HER2-targeting antibody, trastuzumab, developed by Genentech, a wholly owned member of the Roche Group. T?DM1 is in global development by the Roche Group under a collaboration agreement with ImmunoGen.

Among the findings reported were that 1 in 3 study patients had an objective response to treatment with T-DM1. These patients previously had received, on average, seven different drugs for their advanced breast cancer. In a release issued by Genentech in conjunction with the presentation of this data, Genentech noted the need for new treatment options for advanced HER2-expressing breast cancer and its intention of discussing the next steps for T-DM1 with the FDA.

“We’re thrilled with the clinical data reported today,” commented Daniel Junius, ImmunoGen President and CEO. “It’s deeply gratifying to see so many patients respond to T-DM1, particularly when one considers that their cancer previously had been treated with the two approved HER2-targeting agents as well as with multiple chemotherapies. ImmunoGen’s goal in developing our Targeted Antibody Payload, or TAP, technology was to enable the achievement of significant new anticancer therapies, both by us and by our partners. We believe the data reported today are a major step forward in the realization of this vision.”

The findings presented were from a 110-patient Phase II trial assessing T-DM1 for the treatment of advanced (metastatic) HER2-positive breast cancer. To qualify for enrollment, patients must have undergone prior treatment with regimens that included an anthracycline, a taxane, trastuzumab (Herceptin®), lapatinib (Tykerb®) and capecitabine (Xeloda®).1

Among the data reported were:

· The T-DM1 objective response rate (ORR) was 32.7%, as assessed by an independent review facility (IRF). ORR is the proportion of study patients who had a durable complete or partial response to treatment with T-DM1, and was the primary endpoint of the study.

* The clinical benefit rate (CBR) was 44.5%, as assessed by an IRF. CBR includes patients who had stable disease for six months or longer as well as patients who had an objective response to T-DM1. * Among patients who had centrally-confirmed HER2-positive cancer, the ORR was 39.5% and the CBR was 52.6%, as assessed by an IRF. * Among the patients who had qualified for the trial as HER2-positive by local assessment, but were HER2-normal by central assessment, the ORR was 20.0% and the CBR was 26.7%.

The toxicities reported were considered to be acceptable, manageable and consistent with those reported in other T-DM1 trials. The most common severe adverse events were thrombocytopenia (5.5 percent) and back pain (3.6 percent), and the most common adverse events were fatigue (59.1 percent) and nausea (37.3 percent). One patient with pre-existing non-alcoholic fatty liver disease and multiple co-morbidities died from hepatic dysfunction.

About ImmunoGen’s Targeted Antibody Payload (TAP) Technology

The Company’s TAP technology uses antibodies to deliver one of ImmunoGen’s proprietary cancer-cell killing agents (e.g., DM1, DM4) specifically to tumors. ImmunoGen developed these agents specifically for targeted delivery to tumor cells. They are 1,000 – 10,000-fold more potent than standard chemotherapeutics and are designed to be attached to antibodies using one of the Company’s engineered linkers. In addition to T?DM1, five other compounds that make use of ImmunoGen’s TAP technology are in clinical testing.

About ImmunoGen, Inc.

ImmunoGen, Inc. develops targeted anticancer therapeutics using its expertise in cancer biology, monoclonal antibodies and the creation and attachment of potent cancer-cell killing agents. The Company’s TAP technology uses antibodies to deliver one of ImmunoGen’s proprietary cancer-cell killing agents specifically to tumors. In addition to the Company’s product pipeline, compounds utilizing the TAP technology are in clinical testing through ImmunoGen’s collaborations with Genentech (a wholly owned member of the Roche Group), sanofi-aventis, Biogen Idec and Biotest. Other ImmunoGen collaborative partners include Bayer HealthCare and Amgen. More information about ImmunoGen can be found at www.immunogen.com.

This press release includes forward-looking statements. For these statements, ImmunoGen claims the protection of the safe harbor for forward-looking statements provided by the Private Securities Litigation Reform Act of 1995. It should be noted that there are risks and uncertainties related to the development of novel anticancer products, including trastuzumab-DM1 (T-DM1), including risks related to clinical trials and their outcomes, and to regulatory pathways, filings, approvals and timeframes. A review of these risks can be found in ImmunoGen’s Annual Report on Form 10-K for the fiscal year ended June 30, 2009 and other reports filed with the Securities and Exchange Commission.

1 One patient enrolled in the trial had not received a taxane.

Herceptin®, Tykerb® and Xeloda® are registered trademarks of Genentech, GlaxoSmithKline plc, and Roche.

Posted: December 2009

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