CAMBRIDGE, England --
Scientists have made their most important breast cancer discovery since the 1970's.MOST POPULAR: Video, stories and more
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Researchers at the University of Cambridge have pinpointed the gene linked to more than half of all breast cancers.
The gene NRG1 normally acts like a brake, preventing cancer cells from growing. But if the gene is damaged, the brakes are off, allowing cancer cells to grow into a tumor.
The hope is this discovery will help experts target therapies for specific cancers.
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