CD274 and non-small cell lung carcinoma: The ORRs (100% vs. 56.41% [p < 0.001]) were significantly higher in patients with negative PD-L1 expression (IHC 0) than those with positive PD-L1 expression (IHC 1, 2, and 3) (Table 1), suggesting that the expression of PD-L1 was positively related with the radiation resistance in NSCLC.