When we examined PD-L1 levels in radioresistant tumors (A549R26-1 cells-derived) and radiation-sensitive (A549P cells-derived) tumors, we detected higher PD-L1 expression in tumor tissues of A549R26-1 cells-derived xenografts than in tumors of A549P-xenografts (Figure 2I). This evidence concerns the gene CD274 and neoplasm.