[Study on the protective effect of green tea on gastric, liver and esophageal cancers].
OBJECTIVE
To assess the protective effect of drinking green tea on the development of gastric, liver and esophageal cancers.


METHODS
A population based study was conducted in Taixing, Jiangsu province, including 206, 204, 218 cases, respectively, and 415 population controls.


RESULTS
Green tea decreased the development of gastric cancer risk by 40%. Dose-response relationships were observed between the length of time, concentration and quantity of green tea drinking and its protective effects on gastric cancer. For individuals who drink green tea for more than 250 g per month, the risk of gastric cancer reduced about 60%. Green tea might have protective effect on liver cancer. However, no protective effect of green tea was observed on esophageal cancer.


CONCLUSIONS
Green tea drinking might be a protective factor for gastric cancer. However, the protective effects of green tea on liver and esophageal cancer were not obvious.
Mu
Li-na
LN
School of Public Health, Fudan University, Shanghai 200032, China.
Zhou
Xue-fu
XF
Ding
Bao-guo
BG
Wang
Ru-hong
RH
Zhang
Zuo-feng
ZF
Jiang
Qing-wu
QW
Yu
Shun-zhang
SZ
D004305:Dose-Response Relationship, Drug; D004938:Esophageal Neoplasms / Q000517:prevention & control; D006801:Humans; D008113:Liver Neoplasms / Q000517:prevention & control; D010936:Plant Extracts / Q000627:therapeutic use; D013274:Stomach Neoplasms / Q000517:prevention & control*; D013662:Tea / Q000737:chemistry*
D010936:Plant Extracts; D013662:Tea