Scientists have developed a new test that can reveal when cancer began and how quickly it is progressing, helping doctors predict when treatment will be needed.

Diego Mallo , a researcher with the Biodesign Center for Biocomputing, Security and Society at Arizona State University, joins a study led by the Institute of Cancer Research, London, and the Hospital Clinic-IDIBAPS Biomedical Research Institute of Barcelona, Spain. Their findings , published Wednesday in the journal Nature, introduce a novel technique to track the evolutionary history of a tumor from a single sample.

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The new technique, which involves analyzing subtle changes in tumor DNA called methylation, has been tested successfully on diff

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