Despite large sample size, three studies, one in Germans (n = 53,088) [28], the other in Norwegians (n = 4,877) [29], and a study in Chinese (n = 5,566) [26] failed to find an association between CYP24A1 SNP rs6013897 and T2D. This evidence concerns the gene CYP24A1 and type 2 diabetes mellitus.