CAMBRIDGE, Mass., March 18, 2013 (GLOBE NEWSWIRE) -- Merrimack Pharmaceuticals, Inc. (Nasdaq:MACK) announced today that the last patient has been enrolled in a Phase 2, open-label, randomized clinical trial of MM-121, a fully human monoclonal antibody that targets ErbB3, in combination with paclitaxel (Taxol®) versus paclitaxel alone in patients with platinum-resistant or platinum refractory advanced ovarian cancers. MM-121 is being developed in collaboration with Sanofi.