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PLoS By Category | Recent PLoS Articles
Obstetrics - Oncology - Public Health and Epidemiology

Multiple Miscarriages Are Associated with the Risk of Ovarian Cancer: Results from the European Prospective Investigation into Cancer and Nutrition
Published: Friday, May 18, 2012
Author: Marieke G. M. Braem et al.

by Marieke G. M. Braem, N. Charlotte Onland-Moret, Leo J. Schouten, Roy F. P. M. Kruitwagen, Annekatrin Lukanova, Naomi E. Allen, Petra A. Wark, Anne Tjønneland, Louise Hansen, Christina Marie Braüner, Kim Overvad, Françoise Clavel-Chapelon, Nathalie Chabbert-Buffet, Birgit Teucher, Anna Floegel, Heiner Boeing, Antonia Trichopoulou, George Adarakis, Maria Plada, Sabina Rinaldi, Veronika Fedirko, Isabelle Romieu, Valeria Pala, Rocco Galasso, Carlotta Sacerdote, Domenico Palli, Rosario Tumino, H. Bas Bueno-de-Mesquita, Inger Torhild Gram, Oxana Gavrilyuk, Eiliv Lund, Maria-José Sánchez, Catalina Bonet, Maria-Dolores Chirlaque, Nerea Larrañaga, Aurelio Barricarte Gurrea, Jose R. Quirós, Annika Idahl, Nina Ohlson, Eva Lundin, Karin Jirström, Salma Butt, Konstantinos K. Tsilidis, Kay-Tee Khaw, Nick Wareham, Elio Riboli, Rudolf Kaaks, Petra H. M. Peeters

While the risk of ovarian cancer clearly reduces with each full-term pregnancy, the effect of incomplete pregnancies is unclear. We investigated whether incomplete pregnancies (miscarriages and induced abortions) are associated with risk of epithelial ovarian cancer. This observational study was carried out in female participants of the European Prospective Investigation into Cancer and Nutrition (EPIC). A total of 274,442 women were followed from 1992 until 2010. The baseline questionnaire elicited information on miscarriages and induced abortions, reproductive history, and lifestyle-related factors. During a median follow-up of 11.5 years, 1,035 women were diagnosed with incident epithelial ovarian cancer. Despite the lack of an overall association (ever vs. never), risk of ovarian cancer was higher among women with multiple incomplete pregnancies (HR=4vs.0: 1.74, 95% CI: 1.20–2.70; number of cases in this category: n?=?23). This association was particularly evident for multiple miscarriages (HR=4vs.0: 1.99, 95% CI: 1.06–3.73; number of cases in this category: n?=?10), with no significant association for multiple induced abortions (HR=4vs.0: 1.46, 95% CI: 0.68–3.14; number of cases in this category: n?=?7). Our findings suggest that multiple miscarriages are associated with an increased risk of epithelial ovarian cancer, possibly through a shared cluster of etiological factors or a common underlying pathology. These findings should be interpreted with caution as this is the first study to show this association and given the small number of cases in the highest exposure categories.