TIME

Why doctors are turning to the blood to learn more about tumors

BLOOD TESTS CAN TELL US A LOT ABOUT WHAT’S GOING ON in our bodies—from whether we’re eating too much sugar to whether we’re harboring any infectious diseases. Now scientists are also combing the blood to learn more about cancer, with the hope of using that information to figure out the best treatments for their patients.

Called liquid biopsies, these tests pick up genetic material shed by

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