Association studies of VDR allelic variations and T1D done in many countries, including different populations (southern [32] and northern [33] India, Iran [34], Spain [35], Romania [36, 37], Turkey [38, 39], Hungary [40], Portugal [41], UK, US, Norway [42], Japan [42, 43], Finland [42, 44], Poland [45], Croatia [46, 47], Brazil [48], Uruguay [49], Germany [50–52], Greece [53], Bangladesh [54], Taiwan [55], Chile [56], and Italy [57]) yielded conflicting results; some showed significant association while others failed to reach statistical significance, as shown in Table 1. Here, VDR is linked to type 1 diabetes mellitus.