title: [Green tea consumption and the risk of endometrial cancer: a population-based case-control study in urban Shanghai].
abstract: 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.
authors.affiliation: Shanghai Cancer Institute, Shanghai 200032, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Gao
authors.forename: Yong-bing
authors.initials: YB
authors.lastname: Xiang
authors.forename: Wang-hong
authors.initials: WH
authors.lastname: Xu
authors.forename: Chang-xia
authors.initials: CX
authors.lastname: Shao
authors.forename: Zhi-xian
authors.initials: ZX
authors.lastname: Ruan
authors.forename: Jia-rong
authors.initials: JR
authors.lastname: Cheng
authors.forename: Xiao-ou
authors.initials: XO
authors.lastname: Shu
authors.forename: Yu-tang
authors.initials: YT
authors.lastname: Gao
mesh_terms: 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
chemical_list: D013662:Tea