VDR and polycystic ovary syndrome: Several single nucleotide polymorphisms (SNPs) in the VDR gene have been reported, such as ApaI in intron 8 (C/A) (rs7975232), BsmI in intron 8 (G/A) (rs1544410), FokI in exon 2 (C/T) (rs10735810), TaqI in exon 9 (T/C) (rs731236) and Tru9I in intron 8 (G/A) (rs757343). It has been shown that VDR polymorphisms (ApaI, BsmI, FokI, Tru9I and TaqI) may contribute to the PCOS susceptibility, although the findings are as yet inconclusive [14–26].