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  • Title: Excess mortality in mothers of patients with polycystic ovary syndrome.
    Author: Louwers YV, Roest-Schalken ME, Kleefstra N, Roeters van Lennep J, van den Berg M, Fauser BC, Bilo HJ, Sijbrands EJ, Laven JS.
    Journal: Hum Reprod; 2014 Aug; 29(8):1780-6. PubMed ID: 24876175.
    Abstract:
    STUDY QUESTION: Do diabetic parents of patients with polycystic ovary syndrome (PCOS) encounter excess mortality compared with the mortality of men and women with type 2 diabetes, recruited without selection for PCOS? SUMMARY ANSWER: Type 2 diabetes among mothers of PCOS patients results in excess mortality compared with women with diabetes from the general population. WHAT IS KNOWN ALREADY: Insulin resistance is a prominent feature of PCOS. Because of the heritable nature of PCOS, parents of these patients are also prone to develop type 2 diabetes mellitus, which might influence their life expectancy. STUDY DESIGN, SIZE, DURATION: This reverse parent-offspring study included 946 mothers and 902 fathers of patients with PCOS. PARTICIPANTS/MATERIALS, SETTING, METHODS: The medical history of the parents was primarily obtained during the initial screening of each patient and updated via questionnaires. Mortality data of these parents were compared with the mortality rates of the general Dutch population and with mortality rates of a control population consisting of 1353 men and women diagnosed with type 2 diabetes mellitus. The standardized mortality ratio (SMR) was calculated as the ratio of the observed mortality of the parents to the expected mortality in the general Dutch population. The mortality of parents with type 2 diabetes mellitus relative to controls with diabetes but not related to anyone with PCOS was standardized for age, gender and calendar period using Poisson regression. MAIN RESULTS AND ROLE OF CHANCE: In total, 302 parents were deceased in 62 693 person-years. Mothers above age 60 had a significant excess mortality of 1.50 (95% CI 1.15-1.92) compared with the general Dutch population. Moreover, mothers with diabetes had two-times higher mortality risk compared with control women with diabetes (RR 2.0, 95% CI 1.19-3.41). No excess mortality among fathers of PCOS patients was observed. LIMITATIONS, REASON FOR CAUTION: Although recall bias for family history was previously demonstrated to be minimal for long-term chronic diseases, the prevalence of diabetes in the parents was based on their daughter's self-report and was not clinically confirmed. Also, no other additional clinical data regarding the parent population were available. Prospective long-term follow-up studies should be conducted to confirm this excess mortality. WIDER IMPLICATIONS OF THE FINDINGS: Our findings justify screening for type 2 diabetes mellitus among the mothers with a daughter suffering from PCOS to ensure that timely preventive and therapeutic measures according to the appropriate guidelines can be taken. STUDY FUNDING/COMPETING INTERESTS: No particular funding was received for this study. Y.V.L., M.E.R.-S., N.K., J.R.v.L., M.v.d.B., H.J.G.B. and E.J.G.S. do not have any conflict of interest. J.S.E.L. has received fees and grant support from the following companies (in alphabetic order): Ferring, Genovum, Merck-Serono, Organon, Schering Plough and Serono. B.C.J.M.F. has received fees and grant support from the following companies (in alphabetic order): Andromed, Ardana, Ferring, Genovum, Merck Serono, Organon, Pantharei Bioscience, PregLem, Schering, Schering Plough, Serono, and Wyeth. These companies had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
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