Cantuzumab ravtansine (IMGN242, huC242-DM4), an ADC, is a humanized monoclonal antibody, huC242, covalently linked via a disulfide bond to DM4 (HY-12454). Cantuzumab ravtansine has broad antitumor efficacy against a range of CanAg-positive human tumor xenografts[1][2].