[An anticancer drug that is a combination of a monoclonal antibody and a radioisotope (yttrium-90). Monoclonal antibodies are laboratory-produced substances that can locate and bind to cancer cells. Also called IDEC-Y2B8 monoclonal antibody. ( NCI )] (UMLS (NCI) C1134535) Yttrium Y 90 Ibritumomab Tiuxetan; yttrium Y90 ibritumomab tiuxetan; Yttrium-90 Ibritumomab Tiuxetan =Amino Acid, Peptide, or Protein; Pharmacologic Substance; Immunologic Factor