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Diabetes Care, Vol 21, Issue 9 1462-1469, Copyright © 1998 by American Diabetes Association
Troglitazone in combination with sulfonylurea restores glycemic control in patients with type 2 diabetes. The Troglitazone Study Group
ES Horton, F Whitehouse, MN Ghazzi, TC Venable and RW Whitcomb
Joslin Diabetes Center, Boston, Massachusetts, USA.
OBJECTIVE: To determine if the combination of troglitazone (a peroxisome
proliferator-activated receptor-gamma activator) and sulfonylurea will
provide efficacy not attainable by either medication alone. RESEARCH DESIGN
AND METHODS: There were 552 patients inadequately controlled on maximum
doses of sulfonylurea who participated in a 52-week randomized
active-controlled multicenter study. Patients were randomized to micronized
glyburide 12 mg q.d. (G12); troglitazone monotherapy 200, 400, or 600 mg
q.d. (T200, T400, T600); or combined troglitazone and glyburide q.d.
(T200/G12, T400/G12, T600/G12). Efficacy measures included HbA1c, fasting
serum glucose (FSG), insulin, and C-peptide. Effects on lipids and safety
were also assessed. RESULTS: Patients on T600/G12 had significantly lower
mean (+/- SEM) FSG (9.3 +/- 0.4 mmol/l; 167.4 +/- 6.6 mg/dl) compared with
control subjects (13.7 +/- 0.4 mmol/l; 246.5 +/- 6.8 mg/dl; P < 0.0001)
and significantly lower mean HbA1c (7.79 +/- 0.2 vs. 10.58 +/- 0.18%, P
< 0.0001). Significant dose-related decreases were also seen with
T200/G12 and T400/G12. Among patients on T600/G12, 60% achieved HbA1c <
or =8%, 42% achieved HbA1c < or =7%, and 40% achieved FSG < or =7.8
mmol/l (140 mg/dl). Fasting insulin and C-peptide decreased with all
treatments. Overall, triglycerides and free fatty acids decreased, whereas
HDL cholesterol increased. LDL cholesterol increased slightly, with no
change in apolipoprotein B. Adverse events were similar across treatments.
Hypoglycemia occurred in 3% of T600/G 12 patients compared with <1% on
G12 or troglitazone monotherapy CONCLUSIONS: Patients with type 2 diabetes
inadequately controlled on sulfonylurea can be effectively managed with a
combination of troglitazone and sulfonylurea that is safe, well tolerated,
and represents a new approach to achieving the glycemic targets recommended
by the American Diabetes Association.

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Copyright © 1998 by the American Diabetes Association.
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