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Scientists Find Lung Cancer Can Lie Hidden for 20 Years

Lung cancer can lie dormant for more than 20 years before turning deadly, helping explain why a disease that kills more than 1.5 million a year worldwide is so persistent and difficult to treat, scientists said on Thursday. Two papers detailing the evolution of lung cancer reveal how after an initial disease-causing genetic fault - often due to smoking - tumor cells quietly develop numerous new mutations, making different parts of the same tumor genetically unique. By the time patients...

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