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The University of Melbourne, Centre for Genetic Epidemiology, Carlton, Victoria 3052, Australia [J. L. H., G. S. D., D. J. J.]; Departments of Pathology and Research, Peter MacCallum Cancer Institute, Melbourne, Victoria 3000, Australia [M. C. S., D. J. V.]; Cancer Epidemiology Centre, The Anti-Cancer Council of Victoria, Carlton, Victoria 3053, Australia [G. G. G.]; Cancer and Epidemiology Research Unit, New South Wales Cancer Council, Woolloomooloo, New South Wales 2011, Australia [M. R. E. M.]; Department of Preventive and Social Medicine, University of Otago, Dunedin 9001, New Zealand [M. R. E. M.]; Cancer Research Campaign Genetic Epidemiology Unit, Strangeways Research Laboratories, University of Cambridge, Cambridge, United Kingdom [D. F. E.]; and Department of Pathology, The University of Melbourne, Parkville, Victoria 3052, Australia [D. J. V.]
The average breast cancer risk for carriers of a germ-line mutation in BRCA1 or BRCA2 (penetrance) has been estimated from the multiple-case families collected by the Breast Cancer Linkage Consortium (BCLC) to be
80% to age 70. However, women now being tested for these mutations do not necessarily have the intense family history of the BCLC families. Testing for protein-truncating mutations in exons 2, 11, and 20 of BRCA1 and exons 10 and 11 of BRCA2 was conducted in a population-based sample of 388 Australian women with breast cancer diagnosed before age 40. Onset of breast cancer was analyzed in the known and potential mutation-carrying first- and second-degree female relatives of cases found to carry a mutation. Of the 18 mutation-carrying cases (9 BRCA1 and 9 BRCA2), only 5 (1 BRCA1 and 4 BRCA2) had at least one affected relative, so family history of breast cancer was not a strong predictor of mutation status in this setting. The risk in mutation carriers was, on average, 9 times the population risk [95% confidence interval (CI), 423; P < 0.001]. Penetrance to age 70 was 40% (95% CI, 1565%), about half that estimated from BCLC families. By extrapolation,
6% (95% CI, 220%) of breast cancer before age 40 may be caused by protein-truncating mutations in BRCA1 or BRCA2. Breast cancer risk in BRCA1 or BRCA2 mutation carriers may be modified by other genetic or environmental factors. Genetic counselors may need to take into account the family history of the consultand.
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A. B. Spurdle, J. L. Hopper, X. Chen, M. R. E. McCredie, G. G. Giles, D. J. Venter, M. C. Southey, and G. Chenevix-Trench The Progesterone Receptor Exon 4 Val660Leu G/T Polymorphism and Risk of Breast Cancer in Australian Women Cancer Epidemiol. Biomarkers Prev., May 1, 2002; 11(5): 439 - 443. [Abstract] [Full Text] [PDF] |
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A. B. Spurdle, J. L. Hopper, X. Chen, G. S. Dite, J. Cui, M. R. E. McCredie, G. G. Giles, S. Ellis-Steinborner, D. J. Venter, B. Newman, et al. The BRCA2 372 HH Genotype Is Associated with Risk of Breast Cancer in Australian Women Under Age 60 Years Cancer Epidemiol. Biomarkers Prev., April 1, 2002; 11(4): 413 - 416. [Abstract] [Full Text] [PDF] |
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G. Chenevix-Trench, A. B. Spurdle, M. Gatei, H. Kelly, A. Marsh, X. Chen, K. Donn, M. Cummings, D. Nyholt, M. A. Jenkins, et al. Dominant Negative ATM Mutations in Breast Cancer Families J Natl Cancer Inst, February 6, 2002; 94(3): 205 - 215. [Abstract] [Full Text] [PDF] |
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A. B. Spurdle, J. L. Hopper, X. Chen, G. S. Dite, M. R. E. McCredie, G. G. Giles, D. J. Venter, M. C. Southey, D. M. Purdie, and G. Chenevix-Trench The Steroid 5{alpha}-Reductase Type II TA Repeat Polymorphism Is Not Associated with Risk of Breast or Ovarian Cancer in Australian Women Cancer Epidemiol. Biomarkers Prev., December 1, 2001; 10(12): 1287 - 1293. [Abstract] [Full Text] [PDF] |
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W. W. Wang, A. B. Spurdle, P. Kolachana, B. Bove, B. Modan, S. M. Ebbers, G. Suthers, M. A. Tucker, D. J. Kaufman, M. M. Doody, et al. A Single Nucleotide Polymorphism in the 5' Untranslated Region of RAD51 and Risk of Cancer among BRCA1/2 Mutation Carriers Cancer Epidemiol. Biomarkers Prev., September 1, 2001; 10(9): 955 - 960. [Abstract] [Full Text] [PDF] |
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J. Chang, S. G. Hilsenbeck, J. H. Sng, J. Wong, and G. C. Ragu Pathological Features and BRCA1 Mutation Screening in Premenopausal Breast Cancer Patients Clin. Cancer Res., June 1, 2001; 7(6): 1739 - 1742. [Abstract] [Full Text] [PDF] |
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K.-A. Phillips Immunophenotypic and Pathologic Differences Between BRCA1 and BRCA2 Hereditary Breast Cancers J. Clin. Oncol., November 1, 2000; 18(90001): 107s - 112. [Abstract] [Full Text] [PDF] |
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R. W. Haile, K. D. Siegmund, W. J. Gauderman, and D. C. Thomas Study-Design Issues in the Development of the University of Southern California Consortium's Colorectal Cancer Family Registry J Natl Cancer Inst Monographs, December 1, 1999; 1999(26): 89 - 93. [Abstract] [Full Text] |
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J. L. Hopper, G. Chenevix-Trench, D. J. Jolley, G. S. Dite, M. A. Jenkins, D. J. Venter, M. R. E. McCredie, and G. G. Giles Design and Analysis Issues in a Population-Based, Case-Control-Family Study of the Genetic Epidemiology of Breast Cancer and the Co-operative Family Registry for Breast Cancer Studies (CFRBCS) J Natl Cancer Inst Monographs, December 1, 1999; 1999(26): 95 - 100. [Abstract] [Full Text] |
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