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Created page with "==Introduction== PD-1 inhibitors are a type of immunotherapy used in the treatment of cancer. They work by blocking the programmed cell death protein 1 (PD-1), a protein that prevents the immune system from killing cancer cells. By inhibiting PD-1, these drugs allow the immune system to recognize and attack cancer cells more effectively. ==Mechanism of Action== PD-1 inhibitors work by blocking the interaction between PD-1 and its ligands, PD-L1 and PD-..."