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what are the causes of breast cancer for the women, if not from the genes?

My sister- in- law survived from breast cancer 3 yrs ago, but she got no idea where she got it. They dont even have a history of any type of cancer in teh family. Today My Mom, sufferring from cancer to the cervix, we dont ahve any cancer history in the whole family. I dont like to have cancer like them, but I am always thinking that no body is safe from cancer. Esp breast cancer.