Tusamitamab is an IgG1 monoclonal antibody that targets CEACAM5. Tusamitamab can be used to synthesize Tusamitamab ravtansine (SAR408701), which is a first-in-class humanized antibody-drug conjugate (ADC) that combines Tusamitamab and DM4 (a potent maytansine derivative)[1].