The researchers administered decaffeinated green tea capsules called Polyphenon E that contained a mixture of green tea substance called "catechins" twice a day.Laboratory studies have shown that catechins inhibit cancer cell growth, motility and invasion, and stimulate cancer cell death.

The researchers compared the effects of Polyphenon E in 49 men to placebo tablets in 48 men over a one year treatment period.The researchers found that people who had taken the green tea capsule had a significant decrease in prostate-specific antigen (PSA) levels.

Twenty percent of green tea is consumed in Asian countries where prostate cancer death rates are among the lowest in the world, the researchers said.The study was published in the journal Cancer Prevention Research.

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