Role of Combined Anti-PD-1 and Anti-CTLA-4 Therapy in Melanoma Immune Response Background Immune checkpoint inhibitors have made significant progress in clinical oncology, especially anti-PD-1 (anti-programmed death protein 1) and anti-CTLA-4 (anti-cytotoxic T-lymphocyte-associated antigen 4) therapies, which have been proven to induce long-term re...