PROCR and obstructive sleep apnea syndrome: In the field of OSA studies, Kohli et al. used isobaric tagging for the relative and absolute quantification (iTRAQ)-based proteomics approaches to identify differentially expressed proteins in adult OSA patients and found that the urinary endothelial protein c receptor (EPCR) and dermcidin may emerge as novel biomarkers for screening severe OSA patients (Kohli et al., 2019).