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Aim: Although, the effectiveness of metformin in diabetes treatment is well established, its preventive effect in the development of diabetes is still unclear in real world. We aimed to determine the effectiveness of metformin therapy as a single preventive agent in patients with prediabetes in a cohort study (IDPS). Study Design: In this prospective observational study. Place and Duration of Study: Isfahan Endocrine and Metabolism Research Center, Isfahan University of Medical Sciences, Isfahan, Iran. Methodology: We included 410 patients with prediabetes (168 metformin user, 242 non-users), who participated in IDPS. To determine the association between metformin use and incidence of type 2 diabetes, Cox proportional hazard method, Kaplan-Meier and log Rank test were used. Results: In fully adjusted model for all confounders, significant hazard ratio (HR) for staying prediabetes rather than returning to normal was detected in male group of metformin non-user (HR: 2·41 [95% CI 1.01-5.79]; P

Women with polycystic ovary syndrome (PCOS) are at higher risk of type 2 diabetes and cardiovascular disease. The present study was conducted to investigate the prevalence of PCOS in type 2 diabetic patients.Type 2 diabetic women (n = 157) of reproductive age were selected by a convenience sampling method. PCOS was confirmed using the clinical diagnosis criteria proposed in 1990 by the National Institute of Child Health and Human Development Conference of PCOS. The diabetic patients were divided into two groups according to the presence of PCOS. Baseline demographic characteristics were obtained by questionnaire, and body weight, height, waist circumference, blood pressure and some biochemical indices were measured in both groups.The prevalence of PCOS was high (8.3%, 95% confidence interval 4.5-13.4%) in these type 2 diabetic women. The onset of diabetes occurred at a lower age in the PCOS group, who also displayed significantly greater waist circumference and body mass index (p0.05). No difference in lipid profile, glycosylated hemoglobin or blood pressure was observed between the two groups.PCOS is highly prevalent in type 2 diabetic patients. Hence, focusing the treatment on insulin sensitizers in these patients should improve both the metabolic and non-metabolic complications of PCOS.