Except for the result that TG was lower in GCK‐MODY patients compared to those with HNF1A‐MODY (SMD −0.93 [95% CI −1.66, −0.21] mmol/l, p = .01, n = 10; I2 = 96%, Ph <.01), there were no statistical differences observed in regard to other lipid indices in studies that compared GCK‐MODY with HNF1A‐MODY/type 2 diabetes. This evidence concerns the gene HNF1A and type 2 diabetes mellitus.