anatumomab mafenatox anatumomab mafenatox anatumomab mafenatox is a mouse monoclonal antibody studied for the treatment non-small cell lung cancer, which acts as a tumor-targeted superantigen. anatumomab mafenatoxmonoclonal antibodytypefab fragmentsourcemousetargettag-72clinical dataatc codenoneidentifierscas number1370261-50-9 ychemspidernoneunii7e628d4gsq (verify) it is a fusion protein of a human tumor-associated 5t4 antigen monoclonal igg1 fab fragment with an enterotoxin ('mafenatox') of staphylococcus aureus. development was abandoned in 2005.