title: Green tea and stomach cancer--a short review of prospective studies.
abstract: BACKGROUND
  In Japan, green tea has been drunk for a long time. Because it can be drunk casually, many people love drinking it. If such green tea has an effect to prevent stomach cancer, it will be a very convenient way to prevent the disease.
  
  
  METHODS
  To examine the association between green tea consumption and the risk of stomach cancer, past epidemiologic studies including JACC Study were reviewed.
  
  
  RESULTS
  Among eight case-control studies, five showed risk reduction with a statistically significant difference, and two studies showed risk reduction without a statistically significant difference. The remaining study showed the opposite result. Among six prospective studies regarding stomach cancer, no study showed risk reduction with a statistically significant difference. Four of the six studies showed no relation. In terms of study design, prospective studies, which are considered to be more reliable than case-controlled studies, tend to show no risk reduction. The results of case-control studies and prospective studies present considerably different impressions.
  
  
  CONCLUSIONS
  Prospective studies showed no inverse association between the consumption of green tea and the risk of stomach cancer.
authors.affiliation: Department of Public Health, Showa University School of Medicine, Saitama, Japan. hosiyama@human.ac.jp
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Hoshiyama
authors.forename: Takeshi
authors.initials: T
authors.lastname: Kawaguchi
authors.forename: Yoshihiko
authors.initials: Y
authors.lastname: Miura
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Mizoue
authors.forename: Noritaka
authors.initials: N
authors.lastname: Tokui
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Yatsuya
authors.forename: Kiyomi
authors.initials: K
authors.lastname: Sakata
authors.forename: Takaaki
authors.initials: T
authors.lastname: Kondo
authors.forename: Shogo
authors.initials: S
authors.lastname: Kikuchi
authors.forename: Hideaki
authors.initials: H
authors.lastname: Toyoshima
authors.forename: Norihiko
authors.initials: N
authors.lastname: Hayakawa
authors.forename: Akiko
authors.initials: A
authors.lastname: Tamakoshi
authors.forename: Takesumi
authors.initials: T
authors.lastname: Yoshimura
mesh_terms: D001628:Beverages; D016022:Case-Control Studies; D006801:Humans; D007564:Japan / Q000453:epidemiology; D009752:Nutritional Status; D011446:Prospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D013274:Stomach Neoplasms / Q000453:epidemiology* / Q000517:prevention & control; D013662:Tea
chemical_list: D013662:Tea