All of the references below are from this web site: http://www.1stvitality.co.uk/az/cranberry/scientific_documentation.htm

References:  

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27. Kandil FE, Smith MA, Rogers RB, Pepin MF, Song LL, Pezzuto JM, Seigler DS. Composition of a chemopreventive proanthocyanidin-rich fraction from cranberry fruits responsible for the inhibition of 12-O-tetradecanoyl phorbol-13-acetate (TPA)-induced ornithine decarboxylase (ODC) activity. J Agric Food Chem. 2002;50(5):1063-9. ( Medline )

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