7. Small Percentage Linked to Inherited Genes Mutations According to Breast Cancer.org, roughly 5 to 10 percent of breast cancers can be traced to specific, inherited gene mutations, such as the BRCA1 and BRCA2 gene mutations.
8. Know the Dangers of BRCA1 and BRCA2 Genes BRCA1 and BRCA2 gene mutations are the most common. Those with the BRCA1 mutation have a 55-65 percent risk of developing breast cancer before age 70. For women with a BRCA2 mutation, the risk is 45 percent. There’s also an increased ovarian cancer risk associated with these genetic mutations.