[Green tea consumption and the risk of endometrial cancer: a population-based case-control study in urban Shanghai].
OBJECTIVE
To assess the effect of tea consumption on the risk of endometrial cancer.


METHODS
In a population based case-control study conducted in urban Shanghai, face-to-face interviews were completed for 995 incidence cases aged 30 - 69 from January 1997 to December 2002 and 1087 controls that frequency-matched to cases on age. Unconditional logistic model was used for analysis.


RESULTS
An inverse association was observed in tea drinking and endometrial cancer risk. Compared to non-tea drinkers, regular tea drinkers had reduced risk of endometrial cancer (OR = 0.74; 95% CI: 0.54 - 1.01) in premenopausal women. Green tea had a protective effect on endometrial cancer among non-smoking or non-alcohol drinking women (OR = 0.77, P = 0.0199) and the ORs reduced with the increasing concentration of tea being served (P for trend = 0.0493). The multivariate ORs for drinking green tea < 7 times/week and >or= 7 times/week were 0.90 (95% CI: 0.53 - 1.54) and 0.76 (95% CI: 0.60 - 0.95) with the trend test of P = 0.0163.


CONCLUSIONS
Tea drinking, with green tea in particurlar, seemed to have weak but inverse association with endometrial cancer risk, but this effect of protection might only limit to premenopausal women.
Gao
Jing
J
Shanghai Cancer Institute, Shanghai 200032, China.
Xiang
Yong-bing
YB
Xu
Wang-hong
WH
Shao
Chang-xia
CX
Ruan
Zhi-xian
ZX
Cheng
Jia-rong
JR
Shu
Xiao-ou
XO
Gao
Yu-tang
YT
D000328:Adult; D000368:Aged; D016022:Case-Control Studies; D002681:China / Q000453:epidemiology; D016889:Endometrial Neoplasms / Q000453:epidemiology* / Q000517:prevention & control; D005260:Female; D006801:Humans; D016015:Logistic Models; D008875:Middle Aged; D012307:Risk Factors; D011795:Surveys and Questionnaires; D013662:Tea; D014504:Urban Health
D013662:Tea