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Cancer is caused by one of the body’s own stem cells going rogue and dividing out of control.

That can be caused either by intrinsic factors that are part of the innate way the body operates, such as the risk of mutations occurring every time a cell divides, or extrinsic factors such as smoking, UV radiation and many others that have not been identified.

The argument has been about the relative importance of intrinsic and extrinsic factors.

In January, a report in the journal Science tried to explain why some tissues were millions of times more vulnerable to developing cancer than others.

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BBC News

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