Ask the experts
Who does breast cancer affect?
Some of the breast cancer risk factors can be modified (such as alcohol use) while others cannot be influenced (such as age). It is important to discuss these risks with a health-care provider anytime new therapies are started (for example, postmenopausal hormone therapy).
Several risk factors are inconclusive (such as deodorants), while in other areas, the risk is being even more clearly defined (such as alcohol use).
The following are risk factors for breast cancer:
- Age: The chances of breast cancer increase as one gets older.
- Family history: The risk of breast cancer is higher among women who have relatives with the disease. Having a close relative with the disease (sister, mother, daughter) doubles a woman's risk.
- Personal history: Having been diagnosed with breast cancer in one breast increases the risk of cancer in the other breast or the chance of an additional cancer in the original breast.
- Women diagnosed with certain benign breast conditions have an increased risk of breast cancer. These include atypical hyperplasia, a condition in which there is abnormal proliferation of breast cells but no cancer has developed.
- Menstruation: Women who started their menstrual cycle at a younger age (before 12) or went through menopause later (after 55) have a slightly increased risk.
- Breast tissue: Women with dense breast tissue (as documented by mammogram) have a higher risk of breast cancer.
- Race: White women have a higher risk of developing breast cancer, but African-American women tend to have more aggressive tumors when they do develop breast cancer.
- Exposure to previous chest radiation or use of diethylstilbestrol increases the risk of breast cancer.
- Having no children or the first child after age 30 increases the risk of breast cancer.
- Breastfeeding for one and a half to two years might slightly lower the risk of breast cancer.
- Being overweight or obese increases the risk of breast cancer both in pre- and postmenopausal women but at different rates.
- Use of oral contraceptives in the last 10 years increases the risk of breast cancer slightly.
- Using combined hormone therapy after menopause increases the risk of breast cancer.
- Alcohol use increases the risk of breast cancer, and this seems to be proportional to the amount of alcohol used. A recent study reviewing the research on alcohol use and breast cancer concluded that all levels of alcohol use are associated with an increased risk for breast cancer. This includes even light drinking.
- Exercise seems to lower the risk of breast cancer.
- Genetic risk factors: The most common causes are mutations in the BRCA1 and BRCA2 genes (breast cancer and ovarian cancer genes). Inheriting a mutated gene from a parent means that one has a significantly higher risk of developing breast cancer.
What are the statistics on male breast cancer?
Breast cancer is rare in men (approximately 2,400 new cases diagnosed per year in the U.S.) but typically has a significantly worse outcome. This is partially related to the often late diagnosis of male breast cancer, when the cancer has already spread.
Symptoms are similar to the symptoms in women, with the most common symptom being a lump or change in skin of the breast tissue or nipple discharge. Although it can occur at any age, male breast cancer usually occurs in men over 60 years of age.
For more information, read our full medical article on breast cancer signs, symptoms, treatment, and prognosis.
"Overview of the treatment of newly diagnosed, non-metastatic breast cancer"