Anti-CEACAM1 / CD66a (CM-24) is a humanized monoclonal immunoglobulin G4 (IgG4) antibody targeting CEACAM1 and CD66a, with potential immunomodulating and antineoplastic activities. It blocks the binding of CEACAM1-expressing cancer cells to CEACAM1-expressing immune cells and abrogates CEACAM1-mediated immunosuppression. MW: 145.5 KD.