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Science News
".... On average, about 8 of every 100 women will develop breast cancer by age 70. But 50 to 70 of every 100 women with BRCA1 mutations will get the disease before age 70, and usually at much younger ages.
Bissell sees a different story in those numbers. She points to all the women with a BRCA1 mutation who never develop cancer. Plus, she adds, the gene is instrumental for helping repair damaged DNA in every cell of the body. Yet most carriers of the faulty gene develop either breast or ovarian tumors. “So why don’t you get pancreatic cancer or brain cancer?” Bissell asks. For that matter, “why doesn’t the entire breast or the entire body turn into a tumor?”.....
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