Immunogen Inc is a clinical-stage biotechnology company from the United States. Its focus is antibody-drug conjugate, or ADC, technology, which uses an antibody that fixes on a target (its antigen) found on tumor cells to deliver a specific cancer-killing agent. The technology is used in Kadcyla (ado-trastuzumab emtansine)--a registered trademark of Genentech, a member of the Roche Group--to kill solid tumors. Companies such as Amgen, Genentech/Roche, Lilly, Novartis, Sanofi, and Takeda have licensed limited rights to use the ADC technology in their therapies.