pemtumomab pemtumomab pemtumomab (trade name theragyn) is a mouse monoclonal antibody used to treat cancer. the substance has affinity to various types of cancer, like ovarian cancer and peritoneal cancer, via the polymorphic epithelial mucin (pem or muc-1) and delivers the radioisotope yttrium-90 into the tumour. as of 2009, it is undergoing phase iii clinical trials. pemtumomabmonoclonal antibodytype?sourcemousetargetmuc1clinical datatrade namestheragynroutes ofadministrationintraperitonealatc codenoneidentifierscas number646032-04-4 ychemspidernone ny (what is this?) (verify) it has been granted orphan drug status in europe.