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The risk of contralateral breast cancer in women with a mutation of a breast cancer gene (BRCA) is approximately 3% to 5% per year or about 40% at 10 years after the initial diagnosis of breast cancer, with a cumulative lifetime risk of up to 64% in high-risk cohorts.
These genes can be passed from parent to child, increasing the risk of developing cancer in those child that have parent carrying these genes. BRCA1 and BRCA2 genes are located on chromosome 17 and chromosome 13 respectively. There is a 90% chance of developing breast cancer for a woman that has these mutated genes.Britanica on line). Since the discovery of the BRCA1 and BRCA2 in 1994 and 1995 about 80% of the women who inherit mutated forms of these genes will develop breast cancer in their lifetime, usually at relatively early age and woman with BRCA1 mutations have a high risk of developing ovarian cancer as well.