About one woman in 200 has these genes. Having the gene predisposes a woman to cancer, but it is no guarantee that she will.
Generally, women over 50 are more likely to get breast cancer than younger women. Black women are also more likely to have the disease before menopause than white.
A link between breast cancer and hormones is gradually becoming clearer.
Researchers believe that the greater a woman's exposure to the hormone estrogen, the more vulnerable it is to breast cancer.
The estrogen causes the cells to divide, the more the cells divide, the greater the chances of an error occurs and it becomes a cancer.
Exposure of a woman with estrogen and progesterone increases and decreases during his life, influenced by age that she has the first and last period, the average length of your menstrual cycle and its age at first calving.
The risk of developing this cancer increases if her menses before 12 have their first child after 30, stop menstruating after 55 or if your menstrual cycle is shorter or longer than the average of 26-29 days.
Current research indicates that hormones from birth control pills probably do not increase this risk.
Some studies suggest that hormone replacement therapy after menopause can increase the risk, especially when taken for more than 5 years.
There is still discussion about it, however.
High doses of radiation can also be a factor, but low-dose mammograms have almost no risk. The link between diet and breast cancer is much debated. Obesity is a major risk factor, and regular alcohol consumption (more than a few doses a day) can promote disease.
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