Studies assessing circulating omentin concentrations have been conducted among individuals with polycystic ovarian syndrome [28,81,86,91,92,93,94,95,96,97,98], where the majority of them ascertained diminished serum omentin levels [86,92,93,94,96,98], which have also been confirmed by the recent meta-analysis performed by Tang et al. [99]. The gene discussed is ITLN1; the disease is polycystic ovary syndrome.