CD274 and brain neoplasm: Higher CD8+ TILs in brain tumors compared with lung tumors were observed, and low PD-L1 expression (< 1%) brain tumors had significantly higher CD8+ TILs than low PD-L1 expression lung tumors [median: 125.0 (61.5–230.0) vs. 29.0 (4.0–89.0); p = 0.011].