CD274 and non-small cell lung carcinoma: A study of 1156 NSCLC specimens, including 827 sequentially recently resected specimens and 293 biopsy specimens, showed that high PD-L1 expression was observed in 9.7% of 827 NSCLC patients, including 6.5% with adenocarcinoma (ADC, n = 690) and 27.4% with squamous cell carcinoma (SqCC, n = 117).