CCND2 and obstructive sleep apnea syndrome: The nomogram has been recognized as a reliable tool for quantifying disease risk based on multivariate modeling procedures (Luo et al., 2015), and the nomogram constructed by target genes such as CCND2, WT1, E2F2, and IRF1 has been demonstrated to be robust; consequently, CCND2, WT1, E2F2, and IRF1 may be reliable OSA targets.