How do I calculate my risk of breast cancer?
- Age at first period.
- Age at the time of the birth of a first child (or has not given birth)
- Family history of breast cancer (mother, sister or daughter)
- Number of past breast biopsies.
- Number of breast biopsies showing atypical hyperplasia.
What percentage is considered high risk for breast cancer? One out of every eight women will develop breast cancer in their lifetime; this is considered average risk for U.S. women. High risk for breast cancer is defined as a greater than or equal to 20% lifetime risk, or in other words, a one in five chance of developing breast cancer over a lifetime.
What is the strongest risk factor for breast cancer? After gender, age is the most influential risk factor for developing breast cancer. Women younger than age 40 account for only 4.7 percent of invasive breast cancer diagnoses and only 3.6 percent of in situ breast cancer diagnoses. Over 70 percent of all breast cancer diagnoses are made in women who are 50 or older.
What age is the highest risk for breast cancer? Your risk for breast cancer increases as you age. About 80% of women diagnosed with breast cancer each year are ages 45 or older, and about 43% are ages 65 or above. Consider this: In women ages 40 to 50, there is a one in 69 risk of developing breast cancer. From ages 50 to 60, that risk increases to one in 43.