Known and probable breast cancer risk factors:

• being a woman
• getting older
• having a mutation in the BRCA1 or BRCA2 breast cancer genes
• having a previous biopsy showing hyperplasia or carcinoma in situ
• having a family history of breast cancer or ovarian cancer
• having high breast density on a mammogram
• having a personal history of breast or ovarian cancer
• starting menopause after age 55
• never having children
• having your first child after age 35
• being overweight after menopause or gaining weight as an adult
• having more than one drink of alcohol per day
• currently or recently using combined estrogen and progestin hormone replacement therapy (HRT)
• having your first period before age 12