tositumomab
(TAH-sih-TOO-moh-mab)
A drug used together with another drug to treat certain types of B-cell non-Hodgkin lymphoma. It is also being studied in the treatment of other types of cancer. Tositumomab binds to a protein called CD20, which is found on the surface of B cells, and may kill cancer cells. It is a type of monoclonal antibody.