Ipilimumab (Yervoy) is a fully humanized immunoglobulin (Ig)G1 monoclonal antibody that binds to and inhibits cytotoxic T-lymphocyte–associated antigen 4 (CTLA-4). It acts as a T-cell potentiator, leading to increases in T-cell activation and interleukin-2 secretion. Ipilimumab is U.S. Food and...