* Gender: Being a women is the biggest risk factor for being diagnosed with breast cancer
* Aging: Majority of all breast cancer diagnoses are in women over age 50.
* Family History: Breast cancer risk is higher among women whose close blood relatives have this disease.
* Personal history of breast cancer: A woman with cancer in one breast has a three- to four-fold increased risk of developing a new cancer in the other breast or in another part of the same breast.
* Race: White women are slightly more likely to develop breast cancer than are African-American women.
* Previous abnormal breast biopsy
* Early onset of menstrual period (before age 12)
* Late onset of menopause (after age 55)
* Previous breast radiation: Women who as children or young adults have had radiation therapy to the chest area as treatment for another cancer (such as Hodgkin disease or non-Hodgkin lymphoma) have a significantly increased risk for breast cancer.
* Use of Diethylstilbestrol (DES) during pregnancy.
and Breast Cancer Risk
* Not having children, or having your first child after age 30.
* Oral contraceptive use: It is still not certain what part oral contraceptives (birth control pills) might play in breast cancer risk. …