Abstract
Background
Women with a breast cancer susceptibility gene 1 (BRCA1) or breast cancer susceptibility gene 2 (BRCA2) mutation are at increased risk for developing breast and ovarian cancer. Various reproductive and hormonal factors have been shown to modify the risk of breast cancer. These studies suggest that estrogen exposure and deprivation are important in the etiology of hereditary cancer. Many patients are interested in the possibility of an adverse effect of fertility treatment on breast cancer risk. It is important to evaluate whether or not infertility per se or exposure to fertility medications increase the risk of breast cancer in genetically predisposed women.
Methods
We conducted a matched case–control study of 1,380 pairs of women with a BRCA1 or BRCA2 mutation to determine if a history of infertility, the use of fertility medications, or undergoing in vitro fertilization (IVF) were associated with and increased the risk of breast cancer.
Results
Sixteen percent of the study subjects reported having experienced a fertility problem and 4% had used a fertility medication. Women who had used a fertility medication were not at significantly increased risk of breast cancer (odds ratio [OR] = 1.21; 95% confidence interval [CI] = 0.81–1.82) compared to non-users. Furthermore, there was no risk associated with a history of use of a fertility medication when the subjects were stratified by parity: (OR = 1.29; 95% CI = 0.83–2.01 for nulliparous women and OR = 0.81; 95% CI = 0.30–2.22 for parous women).
Conclusions
The results of this study suggest that the use of fertility medications does not adversely affect the risk of breast cancer among BRCA mutation carriers. Given the small sizes of the exposed subgroups, these findings should be interpreted with caution and confirmatory studies are required.
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Abbreviations
- BRCA1 :
-
Breast cancer susceptibility gene 1
- BRCA2 :
-
Breast cancer susceptibility gene 2
- IVF:
-
In vitro fertilization
- OR:
-
Odds ratio
- CI:
-
Confidence interval
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Acknowledgments
Joanne Kotsopoulos is supported by a fellowship from the Canadian Breast Cancer Foundation, Ontario Chapter. Charis Eng is a recipient of the Doris Duke Distinguished Clinical Scientist Award. Susan. L. Neuhausen was supported by NIH CA74415.
Authors’ Contributions
JK: study co-ordinator, analyzed data, performed literature review, prepared manuscript; CL: consultant regarding infertility and its treatment, reviewed exposure data; JL, JG, CKS, PG, HTL, PM, WDF, SR, SM, BP, NT, PA, SC: organized data collection and quality control for their individual centers, reviewed manuscript; PS: performed statistical analysis; SAN: conceived of study, project leader, edited manuscript.
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Other Members of the Hereditary Breast Cancer Clinical Study Group: D. Horsman, British Columbia Cancer Agency, Vancouver, BC, Canada; B. Rosen, Familial Ovarian Cancer Clinic, Princess Margaret Hospital, Toronto, ON, Canada; C. Isaacs, Lombardi Cancer Center, Georgetown University Medical Center, Washington, DC, USA; S. Domchek, Departments of Hematology and Oncology, University of Pennsylvania, USA; R. Gershoni-Baruch, Institute of Genetics, Rambam Medical Center, Haifa, Israel; A. Eisen, Cancer Risk Assessment Clinic, Juravinksi Cancer Centre (Hamilton Regional Cancer Centre), Hamilton, ON, Canada; O. I. Olopade, Center for Clinical Cancer Genetics, University of Chicago, Chicago, IL, USA; E. Friedman, The Suzanne Levy Gertner Oncogenetics Unit, The Chaim Sheba Medical Center, Tel-Hashomer, Israel, and the Sackler School of Medicine, Tel-Aviv University, Tel-Aviv, Israel; H. M. Saal, Hereditary Cancer Program, Division of Human Genetics, Children’s Hospital Medical Center, Cincinnati, OH, USA; S. L. Neuhausen, Epidemiology Division, Department of Medicine, University of California, Irvine, USA; M. Daly, Division of Population Science, Fox Chase Cancer Center, Philadelphia, PA, USA; B. Karlan and R. N. Kurz, Gynecology Oncology, Cedars Sinai Medical Center, Los Angeles, CA, USA; C. Bellati, Section of Genetics, University of Turin, Turin; Italy C. Eng, Chair of Genomic Medicine Institute at the Cleveland Clinic Foundation Cleveland, Cleveland, OH, USA; K. Sweet, Clinical Cancer Genetics Program, Comprehensive Cancer Center, Division of Human Genetics, Department of Internal Medicine, The Ohio State University, Columbus OH, USA; T. Wagner, Department of Gynecology, Division of Senology, Medical University of Vienna and Private Trust for Breast Health, Austria; G. Rennert, National Cancer Control Center, Carmel Medical Center, Haifa, Israel; D. Provencher and C. Maugard, University of Montreal, Quebec, Canada; J. Garber, Dana Farber Cancer Center, W. McKinnon and M. Wood, University of Vermont; D. Gilchrist, University of Alberta; M. Osborne, Strang Cancer Prevention Centre, New York, NY, USA; J. McLennan, University of San Francisco, California, USA; S. Merajver, University of Michigan Comprehensive Cancer Cente;, B. Pasche and T. Fallen, Northwestern University Cancer Genetics Program, Chicago, Illinois, USA; E. Lemire, Division of Medical Genetics, Royal University Hospital and the University of Saskatchewan, Saskatoon, Canada; A. Chudley, Children’s Hospital, Winnipeg, Manitoba, Canada; J. Weitzel, Department of Cancer Genetics, City of Hope National Medical Center, Duarte, California, USA; W. S. Meschino, North York General, North York, ON, Canada; D. Rayson, Queen Elizabeth Health Sciences Centre, Halifax, Nova Scotia, Canada; G. Evans, Regional Genetics Service, St. Mary’s Hospital, Manchester, UK; D. Agnese, Division of Human Genetics, The Ohio State University; and H. Olsson, Jubileum Institute, Department of Oncology, Lund University Hospital, Lund, Sweden.
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Kotsopoulos, J., Librach, C.L., Lubinski, J. et al. Infertility, treatment of infertility, and the risk of breast cancer among women with BRCA1 and BRCA2 mutations: a case–control study. Cancer Causes Control 19, 1111–1119 (2008). https://doi.org/10.1007/s10552-008-9175-0
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DOI: https://doi.org/10.1007/s10552-008-9175-0