As is known, the usual features of LADA patients are: onset of diabetes at > 25 years of age, clinical presentation masquerading as type 2 diabetes, initial control of hyperglycemia with diet and oral anti-diabetic agents, evolution to insulin necessity within months and some features of type 1 diabetes such as low fasting C-peptide and positive anti-GAD antibodies.7 Our patient shared all those characteristics (with age > 35 years at onset of diabetes, he had been non-ketotic and non-insulin dependent for 6 months and insulin deficiency was demonstrated by low serum fasting C-peptide). This evidence concerns the gene INS and type 1 diabetes mellitus.