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Women with deleterious mutations in either the BRCA1 or BRCA2 genes have a high risk of developing breast and/or ovarian cancer.Because different studies look at different populations, and because different types of mutations have somewhat different risks, the risk is best expressed as a range, rather than a single number.
Absolute risk of cancers in BRCA1 or BRCA2 mutation. [4]A number of genes are associated with HBOC. [5] The most common of the known causes of HBOC are: BRCA mutations: [5] Harmful mutations in the BRCA1 and BRCA2 genes can produce very high rates of breast and ovarian cancer, as well as increased rates of other cancers.
Women who have inherited a defective BRCA1 or BRCA2 gene are at a greatly elevated risk to develop breast and ovarian cancer. Their risk of developing breast and/or ovarian cancer is so high, and so specific to those cancers, that many mutation carriers choose to have prophylactic surgery. There has been much conjecture to explain such ...
Jen Culton learned she had the BRCA1 gene mutation after her older sister's breast-cancer diagnosis. She decided to have two of her daughters tested; one daughter also has the BRCA1 gene mutation.
The lifetime risk of a female developing breast and/or ovarian cancer increases if she inherits a harmful mutation of BRCA1 or BRCA2, but the severity depends on the type of mutation. [8] Each year, about 3% of breast cancers and 10% of ovarian cancers result from inherited mutations in the BRCA1 and BRCA2 genes. [9]
In addition to breast cancer in men and women, mutations in BRCA2 also lead to an increased risk of ovarian, uterine tube, prostate and pancreatic cancer. In some studies, mutations in the central part of the gene have been associated with a higher risk of ovarian cancer and a lower risk of prostate cancer than mutations in other parts of the gene.
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