An unprecedented study reveals 72 new breast cancer genes.
Why does that matter? It means we're closer than ever to understanding breast cancer's origins.
BRCA 1 and 2 are well known markers for breast cancer, but they are found in less than one percent of women.
This new research from 300 groups around the world nearly doubles the markers previously identified.
The study included genetic information on more than 275,000 women. Half of those women had breast cancer.
The mutations could help doctors understand why some women are more at risk of developing cancer than others.
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