Among 203 Korean patients with IFG or new-onset type 2 diabetes, 91 were homozygous (TT) for the T allele, 98 were heterozygous for the C allele (TC), and 14 were homozygous (CC) for the C allele of the APOA5 -1131 T > C polymorphism. This evidence concerns the gene APOA5 and type 2 diabetes mellitus.