PDCD1 and neoplasm: No significant differences were observed regarding PD-1 and PD-L1 expression of tumor-infiltrating T cells related to disease stage (49.9 ± 20.8% vs. 57.9 ± 18.3%; p = 0.35 and 53.1 ± 12.9% vs. 41.2 ± 15.9%; p = 0.11).