ImmunoGen, Inc. engages in the development of antibody-based anticancer therapeutics. The company develops its products using its targeted antibody payload (TAP) technology. Its product candidates include Trastuzumab emtansine, a Phase III clinical trial product for HER2+ metastatic breast cancer; lorvotuzumab mertansine, which is in Phase II clinical trial for the treatment of diagnosed metastatic small-cell lung cancer, as well as in a Phase I clinical trial for the treatment of multiple myeloma; IMGN853, a Phase I clinical trial product that targets over-expressed folate receptor 1 in ovarian cancer and other types of solid tumors, including non-small cell lung cancer; and IMGN529, a product in Phase I clinical trial for treatment of non-Hodgkin's lymphoma (NHL) and chronic lymphocytic leukemia. The company's compounds in earlier-stage of development comprise SAR3419, a Phase II clinical trial product to treat CD19-expressing B-cell malignancies, such as NHL and B-cell acute lymphoblastic leukemia; BT-062, a Phase I product, which targets CD138 antigen found on multiple myeloma and various solid tumors; SAR650984, a Phase I clinical trial product for CD38-targeting hematological malignancies; SAR566658, a Phase I clinical trial product for DS6-expressing solid tumors; BAY 94-9343, a Phase I clinical trial product for mesothelin-expressing solid tumors; and Amgen 1 and Amgen 2, which are phase I clinical trial compounds. It has collaborations with Amgen Inc.; Bayer HealthCare; Biotest AG; Eli Lilly and Company; Novartis Institutes for BioMedical Research, Inc.; Genentech, Inc; Sanofi; and Hoffman-La Roche Inc. ImmunoGen, Inc. was founded in 1981 and is headquartered in Waltham, Massachusetts.