A National Cancer Institute (NCI)
report estimates that about 1 in 8 women in the United States
(approximately 13.3 percent) will develop breast cancer during
her lifetime. Breast cancer incidence increases with increase
in age of women. Hereditary genetic mutations cause about 5% of
Risk factors :
Breast cancer occurs nearly 100 times more often in women
than in men.
|30 - 40 yr.
. . . . 1 out of 252
||40 - 50 yr.
. . . . . . 1 out of 68
|50 - 60 yr .
. . . .1 out of 35
||60 - 70 yr .
. . . . . . 1 out of 27
|Ever . . . .
. . . . 1 out of 8
Previous history of breast cancer
Previous breast irradiation
Family history and genetic factors
Having a close relative, such as a mother or sister, with
breast cancer increases the risk.
Benign breast disease
Previous breast biopsy in which the tissue showed atypical
Menstrual periods that began early in life
Menopause began later in life
Lifestyle-related risk factors: Smoking, not having
children, or first child after age 30, oral contraceptives,
obesity and a high-fat diet, physical inactivity, alcohol,
long-term, post-menopausal use of combined estrogen and
Environmental risk factors: Exposure to pesticides, or
other chemicals, is currently being examined as a possible