• Naomi E Allen, Timothy J Key, Laure Dossus, Sabina Rinaldi, Anne Cust, Annekatrin Lukanova, Petra H Peeters, N Charlotte Onland-Moret, Petra H Lahmann, Franco Berrino, Salvatore Panico, Nerea Larrañaga, Guillem Pera, Maria-José Tormo, Maria-José Sánchez, Ramón Quirós J J, Eva Ardanaz, Anne Tjønneland, Anja Olsen, Jenny Chang-Claude, Jakob Linseisen, Mandy Schulz, Heiner Boeing, Eva Lundin, Domenico Palli, Kim Overvad, Françoise Clavel-Chapelon, Marie-Christine Boutron-Ruault, Sheila Bingham, Kay-Tee Khaw, H Bas Bueno-de-Mesquita, Antonia Trichopoulou, Dimitiros Trichopoulos, Androniki Naska, Rosario Tumino, Elio Riboli, and Rudolf Kaaks.
• Cancer Research UK Epidemiology Unit, University of Oxford, Oxford, UK.
• Endocr. Relat. Cancer. 2008 Jun 1; 15 (2): 485-97.

AbstractEpidemiological data show that reproductive and hormonal factors are involved in the etiology of endometrial cancer, but there is little data on the association with endogenous sex hormone levels. We analyzed the association between prediagnostic serum concentrations of sex steroids and endometrial cancer risk in the European Prospective Investigation into Cancer and Nutrition using a nested case-control design of 247 incident endometrial cancer cases and 481 controls, matched on center, menopausal status, age, variables relating to blood collection, and, for premenopausal women, phase of menstrual cycle. Using conditional regression analysis, endometrial cancer risk among postmenopausal women was positively associated with increasing levels of total testosterone, free testosterone, estrone, total estradiol, and free estradiol. The odds ratios (ORs) for the highest versus lowest tertile were 2.66 (95% confidence interval (CI) 1.50-4.72; P=0.002 for a continuous linear trend) for estrone, 2.07 (95% CI 1.20-3.60; P=0.001) for estradiol, and 1.66 (95% CI 0.98-2.82; P=0.001) for free estradiol. For total and free testosterone, ORs for the highest versus lowest tertile were 1.44 (95% CI 0.88-2.36; P=0.05) and 2.05 (95% CI 1.23-3.42; P=0.005) respectively. Androstenedione and dehydroepiandrosterone sulfate were not associated with risk. Sex hormone-binding globulin was significantly inversely associated with risk (OR for the highest versus lowest tertile was 0.57, 95% CI 0.34-0.95; P=0.004). In premenopausal women, serum sex hormone concentrations were not clearly associated with endometrial cancer risk, but numbers were too small to draw firm conclusions. In conclusion, relatively high blood concentrations of estrogens and free testosterone are associated with an increased endometrial cancer risk in postmenopausal women.

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