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A risk factor is something that indicates a woman is more likely than average to develop breast cancer. They are not harmful in themselves. In fact, a woman's risk of developing breast cancer remains low even if she has several risk factors. About 85 percent of women who develop breast cancer do not have significant risk factors.
A history of breast cancer in immediate female relatives, especially at a young age, may indicate a genetic predisposition and constitutes a major risk factor in five to 10 percent of breast cancer patients.
Gender and Age
The two most significant risk factors are being a woman and getting older.
Personal History of Breast Cancer or Other Cancer
The third most significant risk factor is having a personal history of breast cancer. A diagnosis of a typical ductal or lobular hyperplasia after biopsy may increase the risk of developing invasive breast cancer. Women who have been diagnosed with other cancers such as colon, ovarian or endometrial may be at an increased risk.
Personal History of Fibrocystic Changes
Fibrocystic changes do not increase a woman's risk of developing breast cancer since almost all women have some aspect of this condition. Only breast duct lining changes showing abnormalities increase risk. This diagnosis can only be made through a biopsy.
Not all families' histories of breast cancer increase the risk to unaffected family members. The risk increases when a first-degree relative (sister or mother) has developed breast cancer at an early age, particularly in their 30s before menopause, or where multiple family numbers have breast cancer. Both maternal and paternal sides of the family should be considered when looking at family history. Risk seems to increase when cancer has appeared in both breasts of relatives.
Eighty-five to 90 percent of all breast cancers are diagnosed in women with no family history. Breast cancer is individual and based on the interaction between a woman's environment and heredity. American diets, which are high in animal products, contribute to an increase in breast cancer in contrast to vegetarian diets. No evidence exists, despite many scientific studies, of increased risk from exposure to herbicides, pesticides, hair dye, deodorants or other chemicals in our American lifestyle.
Personal History of Radiation
Radiation treatments in the vicinity of the breasts for treatment of childhood cancers increase risk greatly.