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Serum levels of biomarkers are related to obstructive sleep apnoea severity in patients with lung cancer. Relationship between serum levels of a) paraspeckle component-1 (PSPC1), b) transforming growth factor-β1 (TGF-β1), c) programmed cell death ligand-1 (PD-L1) and d) programmed cell death-1 (PD-1) and apnoea–hypopnoea index (AHI) in subjects from the SAIL cohort. r-values correspond to Pearson correlation coefficients. 3
