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Serous ovarian, fallopian tube and primary peritoneal cancers: A comparative epidemiological analysis

Date: 17.11.2010 

Authors: Susan J. Jordan, Adèle C. Green, David C. Whiteman, Suzanne P. Moore, Christopher J. Bain, Dorota M. Gertig, Penelope M. Webb, Australian Cancer Study Group (ovarian cancer) and the Australian Ovarian Cancer Study Group

Invasive serous cancers are diagnosed in the ovary, fallopian tube and peritoneum. It is widely believed that these are variants of the same malignancy but little is known about fallopian tube and primary peritoneal cancers. A comparison of risk factors for these tumor types may shed light on common or distinct aetiological pathways involved in these types of cancer. We investigated risk factors for the three cancers using data from a large Australian population-based case-control study. We included women with incident invasive serous ovarian (n = 627), primary peritoneal (n = 129) and fallopian tube (n = 45) cancer and 1,508 control women. Participants completed a comprehensive reproductive and lifestyle questionnaire.

Logistic regression was used to calculate odds ratios (ORs) and 95% confidence intervals (CIs). Hormonal contraceptive use was inversely related to risk of all three cancers. Parity and breast-feeding were also inversely related to risk of serous ovarian and fallopian tube cancer. In contrast, parous women had an increased risk of peritoneal cancer (OR = 1.8, 95%CI 0.8-3.9), and increasing parity did not lower risk. There was also no association between breast-feeding and peritoneal cancer. However, obesity was associated with a doubling of risk for peritoneal cancer alone (OR = 2.1, 95%CI = 1.3-3.4). The strikingly similar patterns of risk for serous ovarian and fallopian tube cancers and the somewhat different results for primary peritoneal cancer suggest that peritoneal cancers may develop along a different pathway. These results also call into question the role of the physical effects of ovulation in the development of serous ovarian cancer. © 2007 Wiley-Liss, Inc.



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