Research links high levels of circulating insulin-like growth factor I (IGF-I) with increased risk of prostate cancer. Cows' milk contains this hormone and its consumption might elevate the hormone's levels in the blood. A paper just published reviews all relevant experiments done so far and finds out that there is a link between milk consumption and circulating IGF-I levels.
The review includes 15 cross-sectional studies and 8 randomized controlled trials. Taking all researches into consideration the authors found that circulating IGF-I levels was higher in milk consuming subjects. The conclusion of this meta-analysis is that there might be a relation between milk consumption and risk of prostate cancer and maybe some other cancers.
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