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Park SH, Lee J, Yun HJ, Kim S, Lee J.  Metformin Suppresses Both PD-L1 Expression in Cancer Cells and Cancer-Induced PD-1 Expression in Immune Cells to Promote Antitumor Immunity.  Ann Lab Med 2024;44:426-436.  https://doi.org/10.3343/alm.2023.0443