Several transcripts associated with immunological checkpoints, such as SIGLEC15, PDCD1LG2 (PD-L2), TIGIT, PDCD1 (PD-1), CD274 (PD-L1), CTLA4, LAG3, and HAVCR2 (TIM3), play a crucial role in tumor immune evasion. This evidence concerns the gene PDCD1 and neoplasm.