Abstract
Approximately 7% of breast cancer and 10% of ovarian cancer in the United States is thought to be due to the presence of an autosomal dominant susceptibility allele. Two breast cancer susceptibility genes (BRCA1 and BRCA2) now have been identified (Miki et al. 1994; Wooster et al. 1995; Tavtigian et al. 1996) and a third (BRCA3) is being actively sought. Breast cancer susceptibility in families with mutations in these genes appears as an autosomal dominant trait, with breast cancer affecting as many as half of the women in each generation. Thus, both of these genes are considered high penetrance genes, as the majority of individuals with these alterations will ultimately develop breast cancer. Mutations in several other high penetrance genes, such as p53 (associated with Li-Fraumeni syndrome) and MSH2 (associated with hereditary non-polyposis colon cancer) also have been identified as causes of hereditary breast cancer, but are extremely rare in the general population. It is very likely that many other genes contribute to inherited breast cancer susceptibility in families where the incidence of breast cancer is elevated, but where the appearance of breast cancer is more scattered, because fewer numbers of carriers will develop breast cancer as a result of these lower penetrance genes. These genetic alterations are complex and what little is known about candidates for low penetrance cancer susceptibility genes is not yet of clinical use.
Adapted from Blackwood MA, Weber BL (1998) Breast cancer genetics: past, present and future. J Clin Oncol, in press
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Weber, B.L. (1998). Update on Breast Cancer Susceptibility Genes. In: Senn, HJ., Gelber, R.D., Goldhirsch, A., Thürlimann, B. (eds) Adjuvant Therapy of Primary Breast Cancer VI. Recent Results in Cancer Research, vol 152. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-45769-2_5
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DOI: https://doi.org/10.1007/978-3-642-45769-2_5
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