PD-1 and PD-L1: A Comprehensive Guide to Immune Checkpoint Inhibition Introduction to PD-1 and PD-L1 PD-1 (Programmed Cell Death Protein 1) and PD-L1 (Programmed Death-Ligand 1) have become central in immuno-oncology research, serving as key targets in cancer immunotherapy. These proteins play a crucial role in regulating immune responses, particularly in cancer’s ability to evade […]