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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Mild, windy and mainly dry.
It's not Father Christmas' usual mode of transport but these young patients didn't seem to notice.
Mild, generally dry and breezy.