Ipilimumab (trade name Yervoy) is a monoclonal antibody that works to activate the immune system by targeting CTLA-4, a protein receptor that downregulates the immune system. Cytotoxic T lymphocytes (CTLs) can recognize and destroy cancer cells.... Wikipedia

Manufacturer's Website: Yervoy                                                                                                                                     Average retail cost: $7,000/vial