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ImmunoGen, Inc. Announces Trastuzumab Emtansine (T-DM1) Significantly Improved Survival In The EMILIA Phase III Trial

ImmunoGen, Inc. (Nasdaq: IMGN), a biotechnology company that develops anticancer products using its Targeted Antibody Payload (TAP) technology and antibody expertise, today announced that Roche has reported that updated results from its EMILIA Phase III trial show that patients treated with trastuzumab emtansine had a significant improvement in OS compared to those randomized to standard-of-care therapy. Trastuzumab emtansine utilizes ImmunoGen’s TAP technology with the trastuzumab antibody and is in global development by Roche under an agreement between ImmunoGen and Genentech, a member of the Roche Group.

Also reported today was that Genentech has submitted a Biologics License Application (BLA) for trastuzumab emtansine to the US FDA, and that Roche expects to soon submit a Marketing Authorization Application (MAA) to the EMA.

EMILIA 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 with trastuzumab emtansine – used alone – or with lapatinib (Tykerb®) plus capecitabine (Xeloda®), standard-of-care in this setting.

The first EMILIA results were reported at the American Society of Clinical Oncology (ASCO) annual meeting in June 2012, and included that trastuzumab emtansine significantly improved PFS compared to standard-of-care therapy and that fewer of the trastuzumab emtansine-treated patients experienced Grade 3 or higher (severe) adverse events. 1 A previous interim analysis of OS demonstrated a trend towards improved OS in the trastuzumab emtansine-treated patients. The updated results reported today will be presented at an upcoming medical meeting.

“It’s impressive that the overall survival endpoint has already been met – this had been expected to occur well after the submission of the BLA and MAA to the regulatory authorities,” commented Daniel Junius, President and CEO. “We developed our TAP technology to achieve more effective, better tolerated anticancer therapies, and are delighted that people treated with trastuzumab emtansine survived significantly longer than those who received a standard therapy.”

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