Abstract
Type 2 diabetes mellitus (T2DM) is a significant burden in China, where approximately 114 million patients have been diagnosed with diabetes. Chinese patients present with prominent β-cell failure, with resulting deficiency in insulin secretion, particularly early phase insulin secretion leading to postprandial hyperglycemia. Sitagliptin, a selective once-daily oral dipeptidyl peptidase-4 inhibitor, has been shown to improve glycemic control as monotherapy and in combination with other antihyperglycemic agents, including sulfonylureas and metformin. This was a multicenter randomized double-blind placebo-controlled study conducted in China. The study assessed the safety and efficacy of the addition of sitagliptin 100 mg once daily versus placebo on changes from baseline at Week 24 in HbA1c, fasting plasma glucose (FPG) and 2-h post-meal glucose (PMG). Patients were aged 18-79 years, had T2DM with inadequate glycemic control, and were taking a sulfonylurea, with or without metformin. After 24 weeks, sitagliptin reduced HbA1c, FPG, and 2-h PMG significantly more than placebo (between-treatment differences: -0.61%, -16.8 mg/dL, and -32.9 mg/dL, respectively; P <0.001 for all). The addition of sitagliptin was generally well tolerated, with a comparable incidence of adverse events and drug-related adverse events in both treatment groups. The sitagliptin group had a higher incidence of symptomatic hypoglycemia than the placebo group (25/248 [10.1%] vs 13/249 [5.2%], respectively; P = 0.042). Sitagliptin 100 mg once daily significantly improved glycemic control in Chinese patients with T2DM who had inadequate glycemic control with sulfonylurea, with or without metformin therapy. The addition of sitagliptin was generally well tolerated. (clinicaltrials.gov: NCT01590771).
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