CD274 and small cell lung carcinoma: The percentage of tumors with positive PD‐L1 protein expression was 23.5% (136/579), 16.8% (74/441), 52.4% (54/103), 100% (4/4), 6.2% (1/16), and 20.0% (3/15) in the analysis of overall, ADC, SCC, LCC, SCLC, and LCNEC, respectively.