A woman with an unaltered BRCA1 or BRCA2 gene still carries a risk of breast cancer although less than a woman with the altered gene. A nonBRCA positive woman can also do everything "right" ie never drink alcohol, never smoke, never take hormones such as birth control pills or estrogen-based meds, maintain a low BMI, have her kids in her 20s, live in a nonpolluted environment, etc and STILL get breast cancer even under the age of 50. There is no zero percent chance of developing breast cancer.
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....but some are more equal than others.
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