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Hi ANonymous, Unfortunately, the answer is we really don't know. There are testing and future studies on this subject being conducted but in reality science is constant. I am providing you this link to the American Cancer Society which documents "what we know" about breast cancer which you may find helpful. Good luck, http://www.cancer.org/cancer/breastcancer/detailedguide/breast-cancer-ri... MissieDecember 30, 2012 - 6:55am