Drug name (Alternative name): Trastuzumab (Herceptin)Type of drug: Monoclonal antibodyMechanism(s) of Action: Trastuzumab binds to the HER2 (or c-erbB2) proto-oncogeneGenerally used for: Treatment of HER2+ metastatic (spread) breast cancer. This evidence concerns the gene ERBB2 and breast carcinoma.