Diabetes Care 28:1092-1100, 2005
© 2005 by the American Diabetes Association, Inc.
Emerging Treatments and Technologies Original Article |
Effects of Exenatide (Exendin-4) on Glycemic Control and Weight Over 30 Weeks in Metformin-Treated Patients With Type 2 Diabetes
Ralph A. DeFronzo, MD1,
Robert E. Ratner, MD2,
Jenny Han, MS3,
Dennis D. Kim, MD3,
Mark S. Fineman, BS3 and
Alain D. Baron, MD3
1 Division of Diabetes, University of Texas Health Science Center, San Antonio, Texas
2 MedStar Research Institute, Hyattsville, Maryland
3 Amylin Pharmaceuticals, San Diego, California
Address correspondence and reprint requests to Alain D. Baron, MD, Amylin Pharmaceuticals, 9360 Towne Centre Dr., Suite 110, San Diego, CA 92121. E-mail: abaron{at}amylin.com
OBJECTIVEThis study evaluates the ability of the incretin mimetic exenatide (exendin-4) to improve glycemic control in patients with type 2 diabetes failing to achieve glycemic control with maximally effective metformin doses.
RESEARCH DESIGN AND METHODSA triple-blind, placebo-controlled, 30-week study at 82 U.S. sites was performed with 336 randomized patients. In all, 272 patients completed the study. The intent-to-treat population baseline was 53 ± 10 years with BMI of 34.2 ± 5.9 kg/m2 and HbA1c of 8.2 ± 1.1%. After 4 weeks of placebo, subjects self-administered 5 µg exenatide or placebo subcutaneously twice daily for 4 weeks followed by 5 or 10 µg exenatide, or placebo subcutaneously twice daily for 26 weeks. All subjects continued metformin therapy.
RESULTSAt week 30, HbA1c changes from baseline ± SE for each group were 0.78 ± 0.10% (10 µg), 0.40 ± 0.11% (5 µg), and +0.08 ± 0.10% (placebo; intent to treat; adjusted P < 0.002). Of evaluable subjects, 46% (10 µg), 32% (5 µg), and 13% (placebo) achieved HbA1c 7% (P < 0.01 vs. placebo). Exenatide-treated subjects displayed progressive dose-dependent weight loss (2.8 ± 0.5 kg [10 µg], 1.6 ± 0.4 kg [5 µg]; P < 0.001 vs. placebo). The most frequent adverse events were gastrointestinal in nature and generally mild to moderate. Incidence of mild to moderate hypoglycemia was low and similar across treatment arms, with no severe hypoglycemia.
CONCLUSIONSExenatide was generally well tolerated and reduced HbA1c with no weight gain and no increased incidence of hypoglycemia in patients with type 2 diabetes failing to achieve glycemic control with metformin.
Abbreviations: GLP-1, glucagon-like peptide 1

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