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Published online 9 September 2003 | Nature | doi:10.1038/news030908-1

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Menstrual phase influences cancer spread in mice

Study feeds controversy over timing of tumour surgery.

The phase of a mouse's menstrual cycle can dramatically alter the risk of cancer spreading, say researchers in Canada. The finding fuels the debate over whether women's cancer surgery should be timed to specific menstrual stages.

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