Merrimack begins MM-121 Phase 2 combination trial in HER2-negative breast cancer

Merrimack Pharmaceuticals, Inc. announced today that the first patient has been dosed in a randomized Phase 2 clinical trial of MM-121, a fully human monoclonal antibody that targets ErbB3, combined with paclitaxel (Taxol®) in the neoadjuvant setting of HER2-negative breast cancer patients.

The Phase 2 study is designed to evaluate whether the combination of MM-121 with paclitaxel is more effective than treatment with paclitaxel alone when administered as part of a neoadjuvant treatment regimen in HER2-negative, locally advanced breast cancer patients. A total of 200 patients are expected to be enrolled in the study. Following treatment with MM-121 and paclitaxel, or paclitaxel alone, patients will receive standard treatment with doxorubicin and cyclophosphamide and monitored until surgical resection. Multiple sites in North America are currently expected to participate in this study. The first patient was enrolled at Texas Oncology - Memorial City.

Merrimack entered into an exclusive, global collaboration and licensing agreement with Sanofi for MM-121 in 2009.