PDCD1LG2 and neoplasm: Infiltrating T cells in the tumor microenvironment exhibit high PD‐1 protein expression, while tumor cells concurrently overexpress the PD‐1 ligands PD‐L1 and PD‐L2, leading to continuous activation of the PD‐1 pathway, which suppresses T cell function and impairs their ability to eliminate tumor cells.