Most cancer is bad luck, study finds

January 2, 2015 8:12 AM

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Nearly two-thirds of all cancers are caused by random mutations of the body's stem cells, not by hereditary or environmental effects, according to a study released Jan. 1 by Johns Hopkins scientists.

Tissues with the most divisions of regenerative cells — and hence the most chances for mutations — tend to have the greatest rates of cancer, the study found.

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