CD274 and neoplasm: Although PD-1 expression in non-tumor cells was not different between responders and non-responders (Figure S2A), the PD-1/PD-L1 interaction score was non-significantly higher in responders (n = 7, 11; p = 0.055) (Figure 2C) and a score over 200 correlated with improved PFS (n = 6, 12; hazard ratio (HR) = 0.38, 95% CI = 0.11–0.70) (Figure 2D).