CD274 and carcinoma: Spearman's correlation coefficient test also showed positive correlation between the proportion of PD‐L1‐positive carcinoma cells and SUVmax in the analyses of (A) overall (Spearman's rho = 0.4370, P < 0.0001), (B) ADC/SCC/LCC (Spearman's rho = 0.4607, P < 0.0001), (C) ADC (Spearman's rho =0.3559, P < 0.0001) and (D) SCC (Spearman's rho =0.2628, P = 0.0073) (Figure S3).