Labetuzumab (marketed under the trade name CEA-CIDE) is a humanized IgG1 monoclonal antibody for the treatment of colorectal cancer. It selectively binds to carcinoembryonic cell adhesion molecule 5. '-mexi-' (melanoma): Ecromeximab§ Labetuzumab (marketed under the trade name CEA-CIDE) is a humanized IgG1 monoclonal antibody for the treatment of colorectal cancer. It selectively binds to carcinoembryonic cell adhesion molecule 5.