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.
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.