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Effect of tibolone compared with sequential hormone replacement therapy on carbohydrate metabolism in postmenopausal
Inka Wiegratz1, Franz Starflinger, Wolfgang Tetzloff
1Department of Gynecology and Obstetrics, J.W. Goethe-University Frankfurt, Theodor-Stern-Kai 7, D-60590 Frankfurt, Germany.
Objective:
To investigate the effects of tibolone on carbohydrate metabolism, and to compare these effects with those of a sequential regimen of conjugated equine estrogens and medrogestone.
Methods:
This was an open-label, multicentre, comparative study. Seventy-two postmenopausal women were randomized to receive either tibolone 2.5 mg/day or conjugated equine estrogens 0.6 mg plus sequential medrogestone 5 mg (CEE/M) for six 28-day cycles. Carbohydrate metabolism was evaluated at baseline and after three and six cycles of treatment by an oral glucose tolerance test (OGTT). A blood sample was taken at 30, 60, 90 and 120 mm after glucose 75 mg dosing for determination of plasma glucose, insulin and connecting peptide (C-peptide) levels.
Results:
The changes from baseline of glucose, insulin and C-peptide area-under-the-curve (AUC) values were not statistically significant after 3 and 6 months of tibolone or CEE/M treatment. There was a small transitory decrease in HbA(1C) after three cycles of treatment with tibolone.
Conclusion:
The effects of tibolone and CEE/M on carbohydrate metabolism were considered to have no clinical significance.