Abstract
The potential effects of oral contraceptive (OC) and postmenopausal hormone (PMH) use are not well understood among BRCA1 or BRCA2 (BRCA1/2) deleterious mutation carriers with a history of breast cancer. We investigated the association between OC and PMH use and risk of contralateral breast cancer (CBC) in the WECARE (Women’s Environment, Cancer, and Radiation Epidemiology) Study. The WECARE Study is a population-based case-control study of 705 women with asynchronous CBC and 1,398 women with unilateral breast cancer, including 181 BRCA1/2 mutation carriers. Risk-factor information was assessed by telephone interview. Mutation status was measured using denaturing high-performance liquid chromatography followed by direct sequencing in all participants. Outcomes, treatment, and tumor characteristics were abstracted from medical records. Ever use of OCs was not associated with risk among noncarriers (RR = 0.87; 95% CI = 0.66–1.15) or BRCA2 carriers (RR = 0.82; 95% CI = 0.21–3.13). BRCA1 carriers who used OCs had a nonsignificant greater risk than nonusers (RR = 2.38; 95% CI = 0.72–7.83). Total duration of OC use and at least 5 years of use before age 30 were associated with a nonsignificant increased risk among mutation carriers but not among noncarriers. Few women had ever used PMH and we found no significant associations between lifetime use and CBC risk among carriers and noncarriers. In conclusion, the association between OC/PMH use and risk of CBC does not differ significantly between carriers and noncarriers; however, because carriers have a higher baseline risk of second primaries, even a potential small increase in risk as a result of OC use may be clinically relevant.
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Abbreviations
- OC:
-
Oral contraceptives
- PMH:
-
Postmenopausal hormones
- ER:
-
Estrogen receptor
- DHPLC:
-
High-performance liquid chromatography
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Acknowledgments
This work was supported by the National Institutes of Health (U01-CA83178, R01-CA97397 and R01-CA42949). J.C.F. is supported in part by a post-PhD Research Fellowship from the National Cancer Institute of Canada (#017602). We thank all the individuals who participated in this study.
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The authors declare that they have no competing interests.
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WECARE Study Collaborative Group
WECARE Study Collaborative Group
Memorial Sloan Kettering Cancer Center (New York, NY): Jonine L. Bernstein Ph.D. (WECARE Study P·I.); Colin Begg. Ph.D.; MarinelaCapanu Ph.D.; Tracy Layne, M.P·H., Xiaolin Liang M.D.; Irene Orlow Ph.D., Anne S. Reiner, MPH.
City of Hope (Duarte, CA) and work performed at the University of Southern California: Leslie Bernstein Ph.D.; Laura Donnelly-Allen.
Danish Cancer Society (Copenhagen, Denmark): Jørgen H. Olsen, M.D. D.M.Sc.; Michael Andersson M.D.; D.M.Sc.; Lisbeth Bertelsen M.D..Ph.D.; Per Guldberg Ph.D.; Lene Mellemkjær Ph.D.
Fred Hutchinson Cancer Research Center (Seattle, WA): Kathleen E. Malone Ph.D. (Sub-contract P·I.); Noemi Epstein.
International Epidemiology Institute (Rockville, MD) and Vanderbilt University (Nashville, TN): John D. Boice Jr. Sc.D.
Lund University (Lund, Sweden): Åke Borg Ph.D.; Therese Törngren M.Sc.; Lina Tellhed B·Sc.
Mount Sinai School of Medicine (New York, NY): Barry S. Rosenstein Ph.D. (Sub-contract P·I.); David P. Atencio Ph.D.
National Cancer Institute (Bethesda, MD): Daniela Seminara, Ph.D. M.P·H.
New York University (New York, NY): Roy E. Shore Ph.D., Dr.P·H.
Norwegian Radium Hospital (Oslo, Norway): Anne-Lise Børresen-Dale Ph.D. (Sub-contract P·I.); Laila Jansen.
Stanford University (Palo Alto, CA): Alice Whittemore Ph.D.
University of California at Irvine (Irvine, CA): Hoda Anton-Culver Ph.D. (Sub-contract P·I.); Joan Largent Ph.D., M.P·H.
University of California at Los Angeles (Los Angeles, CA): Richard A. Gatti Ph.D.
University of Iowa (Iowa City, IA): Charles F. Lynch M.D., Ph.D. (Sub-contract P·I.); Jeanne DeWall M.A.
University of Southern California (Los Angeles, CA): Robert W. Haile Dr.P·H. (Sub-contract P·I.); Bryan M. Langholz Ph.D.; Duncan C. Thomas Ph.D.; Anh T. Diep; Shanyan Xue M.D.; Nianmin Zhou, M.D; Yong Liu M.D.; Evgenia Ter-Karapetova; Andre Hernandez.
University of Southern Maine (Portland, ME): W. Douglas Thompson Ph.D. (Sub-contract P·I.)
University of Texas, M.D. Anderson Cancer Center (Houston, TX): Marilyn Stovall Ph.D. (Sub-contract P·I.); Susan Smith M.P·H.
University of Virginia (Charlottesville, VA) and work performed at Benaroya Research Institute at Virginia Mason (Seattle, WA): Patrick Concannon, Ph.D.; Sharon Teraoka, Ph.D.; Eric R. Olson; Nirasha Ramchurren, Ph.D.
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Figueiredo, J.C., Haile, R.W., Bernstein, L. et al. Oral contraceptives and postmenopausal hormones and risk of contralateral breast cancer among BRCA1 and BRCA2 mutation carriers and noncarriers: the WECARE Study. Breast Cancer Res Treat 120, 175–183 (2010). https://doi.org/10.1007/s10549-009-0455-5
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DOI: https://doi.org/10.1007/s10549-009-0455-5