a monoclonal antibody being studied in the treatment of certain types of b-cell cancers including chronic lymphocytic leukemia (cll) and follicular non-hodgkin lymphoma. monoclonal antibodies are made in the laboratory and can locate and bind to substances in the body, including cancer cells. humax-cd20 binds to cd20, a protein on the surface of normal b cells and most b-cell tumors. also called ofatumumab.