In addition to female breast cancer, mutations in the BRCA1 gene also increase the risk of several other types of cancer including fallopian tube cancer, male breast cancer, and pancreatic cancer. Many of these mutations change one of the amino acids used to make the BRCA1 protein, resulting in a protein that cannot perform its normal DNA repair function.
http://ghr.nlm.nih.gov/gene/BRCA1
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