Why does cancer relapse?
One compelling theory: Even after a tumor has been surgically removed, cancerous stem cells can swim into a patient’s bone marrow and hide there until they suddenly burst into view, triggering a relapse. A lab in Michigan is finding tantalizing new clues as to how those cells get there, why they lie dormant — and why they sometimes reawaken, with deadly consequences. The goal: To find a way to stop relapses before they start.
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