The serum lipid profiles of the GCK-MODY group (n = 50) were compared with those of the hepatocyte nuclear factor-1 alpha (HNF1A)-MODY group (n = 19), the type 1 diabetes (T1D) group (n = 50), and the type 2 diabetes (T2D) group (n = 54). The gene discussed is HNF1A; the disease is type 1 diabetes mellitus.