Hmm... if you can detect cancerous DNA markers in the bloodstream, it may be too late (with the exception of hematological cancers etc). Ideally you want to catch tumors growing in local tissue environments (i.e. stage 1-2) before they reach the lymphatic and circulatory system.
That said, it might be a useful tool if the DNA markers are treated as a prognostic indicator for treatment, or even detecting cancer subtypes.
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So important. Pres. Obama stated in the SOTU '16 to cure cancer "once and for all"
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