CD274 and neoplasm: Having observed a moderate, yet dose-dependent increase in cell surface expression of PD-L1 by PDA30364/OVA cells after photon25 and carbon ion irradiation (Supplementary Fig. S4), we tested for both radiation types whether addition of PD-L1-blocking antibody would increase tumor cell specific lysis in synergism to irradiation (Supplementary Fig. S6).