Researchers from the National Human Genome Research Institute in the US have been working on the test, which is designed to detect signs of a specific gene - ZNF154 - in the blood, following the discovery that this gene was altered when a tumour was present in the body. 
The new test allows doctors to take a blood sample from patients so they can identify signs of breast, bowel, lung, womb and stomach cancer - the five most deadly forms of the disease.

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