CA15-3 is a reported alias of the human protein 'mucin 1, cell surface associated', encoded by the gene MUC1. Anti-CA15-3 antibodies are available from several suppliers. The full protein is reported to be 1255 amino acid residues in length. Based on antigen name, there may be canine, porcine, monkey, mouse and rat variants of this protein. The CA15-3 antigen is a documented cancer marker. See the antibody supplier page for important details, including specific immunogenicity and validated applications.