Today, what?s known about breast cancer causes remains slim. Only a small fraction of cases trace to genetics. Having your first period at an early age or going through menopause late correlates with increased risk. Bearing multiple kids and breast-feeding may lower your risk. Hormonal birth control and replacement ?therapy? after menopause are implicated too, as is radiation exposure?whether from bombs, treatment of another cancer, or too many CT scans. Environmental toxins, broadly, and a few specific chemicals are named culprits, though few are incontrovertible. Other factors, (like not exercising, drinking alcohol, or being fat for older women) might increase one?s chances. But essentially all the science is correlative. Absolute proof is absent.
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