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Studies: Cancer Can Spread Undetected, Before Tumor Develops

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Research has found that cancer cells can spread unseen, before a tumor develops, and leave a ticking time bomb in the body. But the scientists who made the discovery say it soon may be possible for doctors to target these "silent" cancer cells and kill them before they can kill the patient. The researchers said the ability of these early cancer cells to spread while remaining silent for years explains why a patient can die a long time after being treated for what was thought to...

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