Scientists in Cambridge say they could be only five years away from delivering a routine test that tells us how likely we are to get common cancers.
It follows their discovery of more genetic causes of the disease.
And they hope that by understanding the causes of cancer better, they may get closer to discovering cures, as Elodie Harper reports.
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There'll be a few showers about on Saturday but it will slowly brighten up and Sunday should be mostly dry. It will stay cool in the wind.