CYP2R1 and type 2 diabetes mellitus: Most of the studies focused mainly on the association between SNPs in VDR and T2DM.11 To our knowledge, little is known about genetic polymorphisms in VDBP (rs1155563), DHCR7 (rs12785878) and CYP2R1 (rs10500804) as new genetic markers for T2DM.