The GCK-MODY(MODY2) and HNF1A-MODY(MODY3) forms, each accounting for approximately 30% to 60% of all MODY forms, have a similar prevalence of approximately 1:1000 individuals (16); however, among all causes of MODY, the prevalence of GCK-MODY is slightly higher in some populations in the United States, Germany, Italy, France, and Spain (17). This evidence concerns the gene HNF1A and MODY.