Blood test shows promise for spotting early cancers

Blood test shows promise for spotting early cancers

CHICAGO, ILLINOIS—The elusive dream is that a simple blood test could detect a small tumor growing in your body, giving doctors time to cure you before it’s too late. Today, scientists at GRAIL, a biotechnology company based in Menlo Park, California, that has drawn more than a billion dollars in investment, announced progress toward that goal here at the annual meeting of the American Association for Cancer Research. Using full-genome sequencing to analyze DNA shed into the blood by dying tumor cells, the widely watched company saw evidence of cancer in 65% of about 200 patients already known to have...

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