Tusamitamab (Anti-CEACAM5 / CEA / CD66e) is an IgG1 monoclonal antibody that targets CEACAM5. Tusamitamab can be used to synthesize Tusamitamab ravtansine, which is a first-in-class humanized antibody-drug conjugate (ADC) that combines Tusamitamab and DM4 (a potent maytansine derivative). MW: 145.5 KD.