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Programmed cell death-ligand 1 (PD-L1) expressed on cancer cells can cause immune escape of non-small-cell lung cancer (NSCLC). Elucidation of the regulatory mechanisms of the PD-L1 expression is a prerequisite for establishing new tumor immunotherapy strategies. Ubiquitin C-terminal hydrolase L1 (UCHL1) is a regulator of cellular signaling transduction that is aberrantly expressed in NSCLC. However, it is not known whether UCHL1 regulates the expression of PD-L1 in NSCLC cells. In the present study, we found that UCHL1 promotes the expre