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  • Title: Nonobese women with polycystic ovary syndrome respond better than obese women to treatment with metformin.
    Author: Maciel GA, Soares Júnior JM, Alves da Motta EL, Abi Haidar M, de Lima GR, Baracat EC.
    Journal: Fertil Steril; 2004 Feb; 81(2):355-60. PubMed ID: 14967373.
    Abstract:
    OBJECTIVE: To determine the clinical, hormonal, and biochemical effects of metformin therapy in obese and nonobese patients with polycystic ovary syndrome (PCOS). DESIGN: Controlled clinical study. SETTING: Department of Gynecology of Federal University of São Paulo, São Paulo, Brazil. PATIENT(S): Twenty-nine patients with PCOS. INTERVENTION(S): Patients were treated with 500 mg of p.o. metformin t.i.d. for 6 months. MAIN OUTCOME MEASURE(S): Clinical data as well as serum concentrations of sex steroids, sex hormone-binding globulin (SHBG), gonadotropins, leptin, GH, lipids, insulin, and glucose levels were assessed before and after treatment. RESULT(S): In the metformin group of nonobese patients, the mean fasting serum insulin concentration decreased from a pretreatment value of 12.1 +/- 2.4 to 6.3 +/- 0.6 microU/mL after treatment, and the area under the curve of insulin decreased from 5,189.1 +/- 517.4 to 3,035.6 +/- 208.9 microU/mL per minute. Also in the metformin group of nonobese patients, the mean basal serum total testosterone, free testosterone, and androstenedione concentrations decreased by 38%, 58%, and 30%, respectively. In the obese patients treated with metformin, only free testosterone showed a statistically significant decrease (1.7 +/- 0.2). CONCLUSION(S): Our data suggest that nonobese patients respond better than obese patients to a 1.5 g/day metformin regimen.
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