Data from studies performed on Italian [13], Korean [14], Belgian [15], Dutch [16], Spanish Basque [18], U.S. [39], African American [40], Nigerian [40], Australian [41], Slovenian [49], Japanese [50], Swedish [51,52], Latvian [53], and Chinese [54] populations examining the relation of MICA alleles and/or genotypes to T1D susceptibility revealed controversial results. This evidence concerns the gene MICA and type 1 diabetes mellitus.