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Cancer inhibition by green tea.

Mutat Res 1998 Jun 18;402(1-2):307-10    

Fujiki H; Suganuma M; Okabe S; Sueoka N; Komori A; Sueoka E; Kozu T; Tada Y; Suga K; Imai K; Nakachi K
Saitama Cancer Center Research Institute, Ina, Kitaadachi-gun, Saitama 362, Japan.

Green tea is now an acknowledged cancer preventive in Japan. This paper discusses several important features of (-)-epigallocatechin gallate (EGCG), the main constituent of green tea and tea polyphenols. EGCG and other tea polyphenols inhibited growth of human lung cancer cell line, PC-9 cells with G2/M arrest. 3H-EGCG administered by p.o. intubation into mouse stomach revealed that small amounts of 3H-activity were found in various organs where EGCG and green tea extract had previously demonstrated their anticarcinogenic effects, such as skin, stomach, duodenum, colon, liver, lung and pancreas. Cancer onset of patients who had consumed over 10 cups of green tea per day was 8.7 years later among females and 3.0 years later among males, compared with patients who had consumed under three cups per day. The mechanisms of action of EGCG were briefly discussed with regard to inhibition of tumor necrosis factor-alpha (TNF-alpha) release.

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