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Gefitinib regulates PD-L1 expression in different lung adenocarcinoma cell lines. Flow cytometry analysis of PD-L1 expression in A549 cell lines (A), HCC827 cell lines (B), PC9 cell lines (C), and H1975 cell lines (D). **P<0.01. PD-L1, programmed cell death-ligand 1; DMSO, dimethyl sulfoxide.
