A number of factors have been identified that
incr
ease the risk of breast cancer. One of the strongest of these risk factors is the
history of breast cancer in a relative. About15-20% of women with breast cancer have such
a family history of the disease, clearly reflecting the participation of inherited
(genetic) components in the development of some breast cancers. Dominant breast cancer
susceptibility genes, including BRCA1 and BRCA2, appear responsible for about 5% of all
breast cancer. See related entries to: Breast cancer susceptibility genes; BRCA1; BRCA2.
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