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PD-L1 expression in human lung adenocarcinoma cell lines with or without EGFR mutation. RT-PCR (A) and flow cytometry (B,C,D,E) analysis of PD-L1 expression in A549, H1975, HCC827, and PC9 cell lines. ****P<0.0001. PD-L1, programmed cell death-ligand 1; RT-PCR, reverse transcription polymerase chain reaction; EGFR, epidermal growth factor receptor.
