Green Tea and the Risk of Colorectal Cancer : Pooled Analysis of Two Prospective Studies in Japan

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概要

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• BACKGROUND: Although laboratory experiments suggest protective effects of green tea against colorectal cancer, few prospective cohort studies have been conducted.METHODS: We conducted a pooled analysis of two prospective cohort studies among residents in Miyagi Prefecture in rural northern Japan. The first study started in 1984 and included 26,311 subjects. The second study started in 1990 and included 39,604 subjects. The subjects responded to a selfadministered questionnaire including an item on green tea consumption. With 7 to 9 years of follow-up, 305 colon and 211 rectal cancers were identified in the two cohorts through record linkage to a regional cancer registry. We used Cox regression to estimate the hazard ratio (HR) of colorectal cancer according to the consumption of green tea with adjustment for potential confounders, and pooled the estimates obtained from each cohort by general variance-based method.RESULTS: Multivariate pooled HRs for colon cancer associated with drinking 1-2, 3-4, and 5 or more cups of green tea per day, as compared with less than 1 cup per day, were 1.06 (95% confidence interval [CI] = 0.74-1.52), 1.10 (0.78-1.55), 0.97 (0.70-1.35), respectively (trend p = 0.81). Corresponding HRs for rectal cancer were 0.85 (95% CI = 0.56-1.29), 0.70 (0.45-1.08), 0.85 (0.58-1.23), respectively (trend p = 0.31).CONCLUSIONS: Consumption of green tea was not associated with lower risk of colorectal cancer.J Epidemiol 2005; 15:118-124.

• 日本疫学会の論文
• 2005-07-01

著者

• TSUBONO Yoshitaka

  Division of Health Policy, Tohoku University School of Public Policy

• TSUJI Ichiro

  Division of Epidemiology, Department of Public Health and Forensic Medicine, Graduate School of Medi

• KOIZUMI Yayoi

  Division of Epidemiology, Department of Public Health and Forensic Medicine, Tohoku University Gradu

• NAKAYA Naoki

  Division of Epidemiology, Department of Public Health and Forensic Medicine, Tohoku University Gradu

• SUZUKI Yoko

  Division of Epidemiology, Department of Public Health and Forensic Medicine, Tohoku University Gradu

• Nakaya N

  Division Of Epidemiology Department Of Public Health And Forensic Medicine Tohoku University Graduat

• Nakaya Naoki

  東北大学 医学系研究科運動学分野

• Nakaya Naoki

  Psycho-oncology Division Research Center For Innovative Oncology National Cancer Center Hospital Eas

• Nakaya Naoki

  Psycho-oncology Division National Cancer Center Research Institute East

• Nakaya Naoki

  Division Of Epidemiology Departments Of Public Health And Forensic Medicine Tohoku University Gradua

• Koibuchi Yukio

  Department Of Thoracic And Visceral Organ Surgery Graduate School Of Medicine Gunma University

• Koizumi Yayoi

  東北大学 医学系研究科精神神経学分野

• Koizumi Yayoi

  Department Of Public Health And Forensic Medicine Tohoku University Graduate School Of Medicine And

• Tsuji I

  Division Of Epidemiology Department Of Public Health And Forensic Medicine Tohoku University Graduat

• Tsuji Ichiro

  東北大学 医学系研究科運動学分野

• Tsubono Y

  Division Of Health Policy Tohoku University School Of Public Policy

• Tsubono Yoshitaka

  宮城県立がんセンター研究所 疫学部

• Tsubono Y

  Epidemiology And Biostatistics Division National Cancer Center Research Institute East

• SHIBUYA Daisuke

  Cancer Detection Center, Miyagi Cancer Association

• Shibuya Daisuke

  Miyagi Cancer Society

• Tsuji Ichiro

  東北大学 医学系研究科循環器病態学

• Yoshida Takashi

  Division Of Breast Surgery Saitama Cancer Center

• SUZUKI Yoshinori

  Division of Immunoregulation, Institute for Genetic Medicine, Hokkaido University

• Tsubono Yoshitaka

  Department Of Public Health Tohoku University School Of Medicine

• Suzuki Yoshinori

  Department Of Public Health And Forensic Medicine Tohoku University Graduate School Of Medicine And

• Tsubono Yoshitaka

  Division Of Health Policy Tohoku University School Of Public Policy

• Koibuchi Yukio

  Department Of Psychiatry Tohoku University Graduate School Of Medicine

• Shibuya Daisuke

  Cancer Detection Center Miyagi Cancer Association

• Yokoe Takao

  Fukuoka Institute Of Health And Environmental Sciences

• Nakaya Naoki

  Division Of Epidemiology Department Of Public Health And Forensic Medicine Tohoku University Graduat

• Tsubono Yoshitaka

  Division Of Breast Surgery Saitama Cancer Center

• Tomata Yasutake

  Division Of Epidemiology Department Of Public Health And Forensic Medicine Tohoku University Graduat

• Tsuji Ichiro

  Division Of Epidemiology Department Of Public Health And Forensic Medicine Tohoku University Graduat

• Yoshimura Takesumi

  Department Of Clinical Epidemiology Institute Of Industrial Ecological Sciences University Of Occupa

• Suzuki Yoko

  Division Of Arthritis And Connective Tissue Diseases Labour Welfare Corporation Tohoku Rousai Hospit

• Suzuki Yoshinori

  Division Of Immunoregulation Institute For Genetic Medicine Hokkaido University

• SUZUKI Yoshinori

  Division of Epidemiology, Departments of Public Health and Forensic Medicine, Tohoku University Graduate School of Medicine

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