Imgatuzumab (INN) is a humanized monoclonal antibody designed for the treatment of cancer. It acts as an immunomodulator.'-mexi-' (melanoma): Ecromeximab§ Imgatuzumab (INN) is a humanized monoclonal antibody designed for the treatment of cancer. It acts as an immunomodulator. This drug was developed by Genentech/Roche.