PWRN2 and polycystic ovary syndrome: We then constructed a PWRN2- mediated ceRNA network by analysing three microarray datasets (lncRNA+mRNA microarray in PCOS cumulus cells [19], miRNAs microarray in PCOS cumulus cells [25] and lncRNA+mRNA microarray in KGN/shPWRN2 in this study) to investigate the mechanism of PWRN2. Results revealed the potential roles of ceRNA in oocyte maturation in PCOS.