Green tea may stop colon cancer in its tracks - study NutraIngredients.com 8/9/07 "Green tea may stop the growth of colon tumours in their infancy, suggests a new study using mice, but merely drinking green tea offers no benefits against larger tumours..."Our results suggest that green tea specifically targets initial stages of colon carcinogenesis; the time of administration of green tea is pivotal for effective chemoprevention," ..."Beverage levels of green tea are not likely to inhibit the progress of any large adenomas or adenocarcinomas existing prior to the tea administration," ...The results add to an ever-growing body of science linking consumption to a wide range of health benefits, including lower risk of certain cancers, increased weight loss, improved heart health, and protection against Alzheimer's. Green tea contains between 30 and 40 per cent of water-extractable polyphenols, while black tea (green tea that has been oxidized by fermentation) contains between 3 and 10 per cent. The four primary polyphenols found in fresh tealeaves are epigallocatechin gallate (EGCG), epigallocatechin, epicatechin gallate, and epicatechin...A mechanistic study indicated that green tea decreased the total levels of the early carcinogenesis biomarker beta-catenin and its downstream target cyclin D1."
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