A small percentage of all breast cancers cluster in families. These cancers are described as hereditary and are associated with inherited gene.
About 5% to 10% of breast cancers are thought to be hereditary, caused by abnormal genes passed from parent to child. Most inherited cases of breast cancer.
A small number of people have an increased risk of breast cancer because of their family history. However, most breast cancers are not inherited and do not.
BRCA1 and BRCA2: The most common cause of hereditary breast cancer is an inherited mutation in the BRCA1 or BRCA2 gene. In normal.
Learn how gene mutations can affect breast cancer risk, as well as about how genetic risk factors, but new genetic links are being discovered regularly.