CD274 and non-small cell lung carcinoma: The reported extents of PD‐L1 positive expression in NSCLC ranged from 7.4% to 72.7%, which could be explained by the differences in the choice of primary IHC antibody, ethnicity, cut‐off value of positivity, and histologic types 15, 26, 27, 28, 29, 31, 32, 34, 35.