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Cancer analysis tools circumvent biopsies

Aubrey Zapanta works in the lab at Guardant Health, which can analyze cancer through simple blood tests,
Aubrey Zapanta works in the lab at Guardant Health, which can analyze cancer through simple blood tests, Jim Wilson/New York Times

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Telltale traces of a tumor are often present in the blood. These traces — either intact cancer cells or fragments of tumor DNA — are present in minuscule amounts, but numerous companies are now coming to market with sophisticated tests that can detect and analyze them.

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