No significant reduction in mean average daily glucose was found in the studied groups (−0.21 ± 0.61 mmol/l, p = 0.2154; −0.09 ± 0.51 mmol/l, p = 0.4686; −0.27 ± 1.27 mmol/l, p = 0.4710 for HNF1A-MODY, GCK-MODY and T2DM, respectively). This evidence concerns the gene GCK and type 2 diabetes mellitus.