CD274 and non-small cell lung carcinoma: As shown in Figure 1, PC-9 cells (del E746_A750) and H3255 cells (L858R) were negative for PD-L1 IHC, and HCC827 cells (del E746_A750) showed positive expression for PD-L1 membrane staining (H-score: 145) that is weaker than that observed in other non-small cell lung cancer cell lines such as SW900, a lung squamous cancer cell line (H-score: 210).