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Kaplan-Meier curves showing (A, C) disease-free and (B, D) overall survival of primary lung adenocarcinoma patients according to IL-38 expression in the analysis of (A, B) PD-L1-negative cases and (C, D) PD-L1-positive cases. IL-38: interleukin-38, PD-L1: programmed cell death-ligand 1.
