About seven years ago, researchers at the US DNA sequencing company Illumina started to notice something odd. A new blood test it ran on 125,000 expectant mothers looking for genetic abnormalities such as Down’s syndrome in their foetuses returned some extremely unexpected signals in 10 cases. Chillingly, it dawned on them that the abnormal DNA they were seeing wasn’t from the foetuses but was, rather, undiagnosed cancer in the mothers.
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