This one, is, I think, different from a couple of other tests that have been noted in the last year or so:
Rather than screening for factors released by the incipient tumor into the blood stream, the test Dr. Vachani and colleagues used looked at gene expression in the subject's own circulating white blood cells. "We found that the types of genes present in these cells could tell us whether or not cancer was present," explained Dr. Vachani.
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