Oral contraceptives, reproductive history and risk of colorectal cancer in the European Prospective Investigation into Cancer and Nutrition

K. K. Tsilidis, N. E. Allen, T. J. Key, K. Bakken, E. Lund, F. Berrino, A. Fournier, A. Olsen, A. Tjonneland, K. Overvad, M-C Boutron-Ruault, F. Clavel-Chapelon, G. Byrnes, V. Chajes, S. Rinaldi, J. Chang-Claude, R. Kaaks, M. Bergmann, H. Boeing, Y. KoumantakiG. Stasinopoulou, A. Trichopoulou, D. Palli, G. Tagliabue, S. Panico, R. Tumino, P. Vineis, H. B. Bueno-de-Mesquita, F. J. B. van Duijnhoven, C. H. van Gils, P. H. M. Peeters, L. Rodriguez, C. A. Gonzalez, M-J Sanchez, M-D Chirlaque, A. Barricarte, M. Dorronsoro, Signe Borgquist, Jonas Manjer, B. van Guelpen, G. Hallmans, S. A. Rodwell, K-T Khaw, T. Norat, D. Romaguera, E. Riboli

Research output: Contribution to journalArticlepeer-review

Abstract

BACKGROUND: Oral contraceptive use and reproductive factors may initiate long-term changes to the hormonal milieu and thereby, possibly influence colorectal cancer risk. METHODS: We examined the association of hormonal and reproductive factors with risk of colorectal cancer among 337 802 women in the European Prospective Investigation into Cancer and Nutrition, of whom 1878 developed colorectal cancer. RESULTS: After stratification for center and age, and adjustment for body mass index, smoking, diabetes mellitus, physical activity and alcohol consumption, ever use of oral contraceptives was marginally inversely associated with colorectal cancer risk (hazard ratio (HR), 0.92; 95% confidence interval (CI), 0.83-1.02), although this association was stronger among post-menopausal women (HR, 0.84; 95% CI: 0.74-0.95). Duration of oral contraceptive use and reproductive factors, including age at menarche, age at menopause, type of menopause, ever having an abortion, parity, age at first full-term pregnancy and breastfeeding, were not associated with colorectal cancer risk. CONCLUSION: Our findings provide limited support for a potential inverse association between oral contraceptives and colorectal cancer risk. British Journal of Cancer (2010) 103, 1755-1759. doi:10.1038/sj.bjc.6605965 www.bjcancer.com Published online 2 November 2010 (C) 2010 Cancer Research UK
Original languageEnglish
Pages (from-to)1755-1759
JournalBritish Journal of Cancer
Volume103
Issue number11
DOIs
Publication statusPublished - 2010

Subject classification (UKÄ)

  • Cancer and Oncology

Free keywords

  • cohort
  • colorectal cancer
  • oral contraceptives
  • reproductive history
  • study

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