By Ben Hirschler LONDON (Reuters) - 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. ... via Health News Headlines - Yahoo News Read More Here..
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