The results showed that negative correlation was between PD-L1 expression and CD8+ TILS expression density in tumors (r = −0.461, P < 0.001), which was similar to Burrack et al.'s report that PD-L1 expression was linked to CD8+ TILS density in pancreatic cancer tissues. The gene discussed is CD8A; the disease is familial pancreatic carcinoma.