KCNJ11 and diabetes mellitus: Several studies have described the improvement in glycaemic control in patients with a KCNJ11 or ABCC8 mutation after transferral from insulin to sulfonylurea therapy.7, 8, 9, 10 We found no data to suggest whether the progress in genetic testing has resulted in reduced time from diagnosis of diabetes to referral for genetic analysis during the past decade or the effect of early genetic diagnosis on the clinical management of patients.