US research links cancer to plain bad luck

Most types of cancer cannot be blamed on heredity or risky habits like smoking, says a US medical study, suggesting that two-third of the disease cases are caused by the "bad luck" of random DNA mutations. "This study shows that you can add to your risk of getting cancers by smoking or other poor lifestyle factors," said study author Bert Vogelstein, a professor of oncology at the Johns Hopkins University School of Medicine.

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