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When substances extracted from green tea were given to 32 men at high risk of developing prostate cancer, only one man had developed the disease one year later, compared to nine men out of a similar group who were given only a placebo. All the men in the study had high-grade prostatic intraepithelial neoplasia - premalignant lesions that are known to predict the development of invasive prostate cancer within one year in nearly a third of all cases. The men in the treatment group were given three 200mg tablets of green tea catechins a day, a dose equivalent to what a typical Chinese tea drinker will consume over one or two days. (96th Annual Meeting of the American Association for Cancer Research, April 2005).