Additionally, expression levels of PD-1 in TILs, but not in PBMCs and NILs, in the right-sided were significantly higher than left-sided CRC patients {mean ± SEM; 47.7 ± 9.8 vs. 23.9 ± 4.5, p = 0.02} (Figure 3F). This evidence concerns the gene PDCD1 and colorectal carcinoma.