CD274 and neoplasm: Remarkably, combining DTP-PDT and α-PD-L1 demonstrated a significant abscopal effect, with 83.31% primary tumor regression (p < 0.001 vs. model and α-PD-L1) and 82.15% distant tumor suppression (p < 0.001 vs. model, p < 0.01 vs. α-PD-L1, p < 0.05 vs. PDT) (Figures 6C,D).