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ImmunoGen, Inc. Announces Overall Survival Data Reported For Trastuzumab Emtansine (T-DM1) Phase III EMILIA Trial

, (Nasdaq: IMGN), a biopharmaceutical company that develops anticancer products using its Targeted Antibody Payload (TAP) technology and antibody expertise, have announced the presentation of overall survival (OS) data from the trastuzumab emtansine Phase III trial, . Trastuzumab emtansine is in global development by Roche under an agreement between and , a member of the , and utilizes ImmunoGen’s TAP technology with the trastuzumab antibody. and Roche have applied for marketing approval of trastuzumab emtansine in the US and Europe, respectively.

The EMILIA trial was designed to evaluate trastuzumab emtansine for the treatment of patients with metastatic HER2-positive breast cancer who have previously received trastuzumab (Herceptin®) and a taxane. Patients enrolled were randomized to treatment either with trastuzumab emtansine – used alone – or with lapatinib (Tykerb®) plus capecitabine (Xeloda®), standard-of-care in this setting. EMILIA progression-free survival (PFS) and tolerability findings were previously reported at the (ASCO) annual meeting in June 2012: patients treated with trastuzumab emtansine had a significant improvement in PFS (hazard ratio=0.65, p<0.0001) and experienced fewer Grade 3 or greater (severe) adverse events (40.8 percent vs. 57.0 percent) than those treated with standard-of-care.1 PFS and OS are co-primary endpoints of the EMILIA trial.

The OS data reported today showed that the risk of death was reduced by 32 percent for patients who received trastuzumab emtansine compared to those who received standard-of-care (hazard ratio=0.68, p=0.0006). Patients treated with trastuzumab emtansine survived a median of 5.8 months longer than those who received Tykerb plus Xeloda: median OS was 30.9 months for patients receiving trastuzumab emtansine versus 25.1 months for patients receiving standard-of-care.

“We’re thrilled that trastuzumab emtansine provided this significant overall survival benefit,” commented Daniel Junius, President and CEO. “We believe trastuzumab emtansine is an important new medicine and are hopeful it will advance into the hands of practicing oncologists as rapidly as possible.”

The data were presented at the ESMO 2012 Congress in Vienna, Austria (abstract #LBA12; oral presentation at 2:10 pm CEST 1st October 2012). The results of the EMILIA study were also published in the New England Journal of Medicine (http://www.nejm.org).

Other Trastuzumab Emtansine Registration Trials

In HER2-positive breast cancer – Roche has Phase III trials underway evaluating trastuzumab emtansine both for newly diagnosed and for previously treated metastatic disease. It plans to initiate a trial program in early stage disease in 2013, with studies to evaluate the compound for adjuvant use, for neoadjuvant use, and as a treatment for patients with residual invasive disease following standard neoadjuvant therapy.

In HER2-positive gastric cancer – Roche is assessing trastuzumab emtansine for the treatment of advanced, relapsed HER2-positive gastric cancer.

About ImmunoGen’s TAP Technology

A TAP compound consists of a monoclonal, or manufactured, antibody that binds specifically to a target found on tumor cells with one of the Company’s proprietary highly potent cancer-killing agents attached as a payload. The antibody serves to target the payload specifically to the cancer cells, and the payload serves to kill the cancer cells. Trastuzumab emtansine employs ImmunoGen’s non-cleavable SMCC linker and DM1 cancer-killing agent.

Source

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 emtansine (T-DM1), including risks related to clinical studies and regulatory submissions, their timing and results. A review of these risks can be found in ImmunoGen’s Annual Report on Form 10-K for the fiscal year ended June 30, 2012 and other reports filed with the Securities and Exchange Commission.

1ASCO June 2012 (abstract #LBA1).

Tykerb® is a registered trademark of GlaxoSmithKline plc. Xeloda® is a registered trademark of Roche. Herceptin® is a registered trademark of Genentech, a member of the Roche Group.

ImmunoGen, Inc.