Based on these considerations, the aim of the present study was to investigate whether the FokI, BsmI, ApaI, TaqI, and Tru9I polymorphisms of the VDR gene, the DraII polymorphism of the PTH gene, and the PmlI and NsiI polymorphisms of the INSR gene were associated with PCOS risk. The gene discussed is VDR; the disease is polycystic ovary syndrome.