According to the NCI website tositumomab A murine IgG2 monoclonal antibody directed against the CD20 antigen, found on the surface of B-cells. Tositumomab binds to the CD20 surface membrane antigen, resulting in apoptosis, and may stimulate antitumoral cell-mediated and/or antibody-dependent cytotoxicity.

Indikationen/Anwendungsmöglichkeiten gemäss MedlinePlus:
Tositumomab injection is used to treat non-Hodgkin's lymphoma (cancer that begins in the cells of the immune system) that has not improved or that had improved after treatment with other medications, but later returned. Tositumomab injection is in a class of medications called monoclonal antibodies with radioisotopes. It works by attaching to cancer cells and releasing radiation to damage the cancer cells.

Link to Drug Information Portal, a service of the U.S. National Library of Medicine, National Institutes of Health
Link to MedlinePlus, a service of the U.S. National Library of Medicine, National Institutes of Health
Link to National Cancer Institute
Link to National Cancer Institute (Iodine I 131 tositumomab)
Link zu Wiki
Link to Physicians Desk Reference (PDR)
Link to European Medicines Agency (EMEA)
Info for Patients presented by Scott Hamilton from Chemocare.com