Scientists have discovered that DNA errors linked to an increased risk of breast cancer affect five times as many genes than were previously known.
Researchers from across the world found 352 DNA errors that they believe with "reasonable confidence" target 191 genes, fewer than a fifth of which were previously recognised.
The international study compared the DNA of 109,900 breast cancer patients to that of around 88,937 healthy controls, all of them having European ancestry.
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