For all patients, serum PD-L1 levels significantly correlated with tumor PD-L1 level (R = 0.32, p < 0.001; Fig. 2A) and the number of CD8+ TILs (R = 0.29, p = 0.001; Fig. 2B); tumor PD-L1 levels were also associated with the number of CD8+ TILs (R = 0.32, p < 0.001; Fig. 2C). The gene discussed is CD8A; the disease is neoplasm.