The age at the first full term pregnancy is a more accurate predictor of risk than is the number of pregnancies. Long term use of birth control pills or estrogens for more than 10-15 years has been associated with an increased risk of breast cancer. Oral contraceptive use for more than ten years can increase the risk of developing cancer before 45 years of age. Use of oral contraceptives for more than 4 years before a first pregnancy can lead to a marked increase in the risk of developing breast cancer at a relatively early age. Living in affluent and westernized countries is associated with an increased risk of breast cancer.
Asian women have one of the lowest risks of breast cancer.
However, female immigrants of Asian descent and their female children have a risk similar to other westernized women. This of course suggests a dietary link, however studies have failed to show a link between dietary fat and breast cancer development. Women who have been diagnosed with benign breast disease should not be complacent and must realize that they also have an increased risk of developing breast cancer. The most common benign breast disease is fibrocystic breast disease. A high index of suspicion must be maintained if the diagnosis and a chance at early treatment and perhaps a cure are not to be missed.