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09 September 2015 : Clinical Research  

Effect of Linagliptin on Glycemic Control in Chinese Patients with Newly-Diagnosed, Drug-Naïve Type 2 Diabetes Mellitus: A Randomized Controlled Trial

Wenjun WuAB, Ying LiBC, Xiong ChenBC, Dini LinCD, Songying XiangCD, Feixia ShenABCDEFG, Xuemei GuDE

DOI: 10.12659/MSM.894026

Med Sci Monit 2015; 21:2678-2684

Abstract

BACKGROUND: This study aimed to evaluate the efficacy and safety of linagliptin (a novel dipeptidyl peptidase (DPP)-4 inhibitor) on glucose metabolism and β-cell function in Chinese patients with newly-diagnosed, drug-naïve type 2 diabetes mellitus (T2DM).

MATERIAL AND METHODS: Newly-diagnosed and drug-naïve T2DM patients were enrolled. After 4-week lifestyle modulation and 2-week placebo run-in, 57 patients were randomized to double-blind treatment with linagliptin (n=34) or placebo (n=23). The primary endpoint was the change from baseline in glycosylated hemoglobin A1c (HbA1c) after 24 weeks. Fasting plasma glucose (FPG), 2-h postprandial plasma glucose (2h-PPG), fasting insulin, proinsulin-to-insulin ratio, homeostasis model assessment of insulin resistance (HOMA-IR), and homeostasis model assessment of β-cell function (HOMA-β) were also evaluated.

RESULTS: Baseline characteristics were similar between the 2 groups. Compared with placebo, linagliptin therapy resulted in a significant decrease in HbA1C (–1.2±0.7% vs. –0.4±0.4%, P<0.001), FBG (–0.98±1.17 vs. –0.32±0.51 mmol/L, P=0.011, and 2h-PPG (–2.02±0.94 vs. –0.97±0.63 mmol/L, P<0.001). Significant differences were observed for the proinsulin/insulin ratio (P<0.001) and HOMA-β index (P=0.001). Rates of adverse events were similar between the 2 groups (30.3% vs. 27.3%). All adverse events were mild. One patient discontinued participation due to pregnancy.

CONCLUSIONS: Linagliptin treatment resulted in a significant and clinically meaningful improvement of glycemic control in drug-naïve Chinese patients with T2DM, as well as improved parameters of b-cell function. Linagliptin had an excellent safety profile.

Keywords: Blood Glucose - analysis, Blood Pressure, Body Mass Index, Diabetes Mellitus, Type 2 - drug therapy, Dipeptidyl-Peptidase IV Inhibitors - therapeutic use, Double-Blind Method, Hemoglobin A, Glycosylated - metabolism, Homeostasis, Hyperglycemia - drug therapy, Hypoglycemic Agents - therapeutic use, Insulin Resistance, Insulin-Secreting Cells - metabolism, Life Style, Linagliptin - therapeutic use, Postprandial Period, Time Factors

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750