Effects of a Iow-dose estrogen-antiandrogen combination (Diane-35) on lipid and carbohydrate metabolism in patients with polycystic ovary syndrome

Abstract

This study was undertaken in order to evaluate the effect of an oral contraceptive containing 35 micrograms of ethinyl estradiol and 2 mg of cyproterone acetate (Diane-35) on carbohydrate and lipid metabolism in patients with polycystic ovary syndrome (PCOS). Twenty three patients with PCOS were treated with Diane-35 for between 9 and 18 cycles without interruption (a total of 318 treated cycles). Metabolic evaluations, which included measurements of fasting blood glucose, insulin, C-peptide, total cholesterol, triglyceride, total lipids, HDL-cholesterol, LDL-cholesterol and apolipoproteins (Apo A1, Apo A2 and Apo B), were performed before treatment and every 3rd cycle during the treatment period. In the case of 5 women an oral glucose tolerance test (oGTT) was performed before and after the 12th cycle of Diane-35 treatment, with blood samples taken for glucose, insulin and C-peptide measurements. Total cholesterol showed a significant increase after the 6th cycle (p less than 0.001) and reached the mean maximal value after the 9th cycle. A similar increasing trend was observed with LDL-cholesterol, which also reached the maximal mean level after the 9th cycle of treatment (p less than 0.05). There were no significant changes in HDL-cholesterol levels. Significant increases in serum triglyceride (p less than 0.01) and total lipids (p less than 0.001) were observed after the 3rd cycle. Apo A2 concentrations increased significantly after the 6th cycle (p less than 0.001) and showed an increasing trend thereafter. A significant increase was also observed in Apo B concentrations after the 6th cycle but these decreased after the 12th cycle. In spite of these observed increases in serum lipids and lipoproteins, the mean levels remained within the normal range throughout the treatment period. Fasting serum glucose, insulin and C-peptide concentrations did not show any significant changes during the study. Higher insulin and C-peptide responses during the oGTT were observed after the 12th cycle but the differences in the areas under the curve before and after treatment were not significant. A deterioration of blood glucose was observed after treatment with Diane-35, a significant difference in mean values being noted 150 minutes after the glucose overload (p less than 0.005). However, the areas under the curve in blood glucose response before (34.92 +/- 4.12) and after (43.45 +/- 3.61) treatment were not significantly different.(ABSTRACT TRUNCATED AT 400 WORDS)