CD274 and neoplasm: The tumor SUVmean was significantly higher than control tissue (1.00 ± 0.16 SUVmean vs. 0.39 ± 0.08 SUVmean; for tumor and muscle, respectively; p ≤ 0.0001; N = 5; Figure 3D), and PD-L1 expression in the tumor was confirmed by IHC (Figure 3C).