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Environment vs. genetic risk?

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Question from BerniceT: Although science has only discovered BRCA1 and BRCA2, is it likely that all breast cancers are caused by an as-yet-undiscovered gene mutation? Or does environment alone cause breast cancer? I tested negative for 1 and 2, but still wonder if it was caused by some other unknown defective gene. I want to know what advice to give my daughter once she has grown up.
Answers - Carol Cherry, M.S.N., R.N., A.P.R.N., B.C. I think that we believe most cancers come from a series of events that are gene and environment-interaction-based. Lots of research is taking place to more fully understand these complex events. Depending on the age of your daughter now, by the time she grows up, we may have a much better understanding of all the factors that lead to development of cancer.

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