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

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