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American Journal of Epidemiology Advance Access originally published online on July 29, 2009
American Journal of Epidemiology 2009 170(6):730-738; doi:10.1093/aje/kwp187
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American Journal of Epidemiology © The Author 2009. Published by the Johns Hopkins Bloomberg School of Public Health. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org.

ORIGINAL CONTRIBUTIONS

Green Tea Consumption and Hematologic Malignancies in Japan

The Ohsaki Study

Toru Naganuma, Shinichi Kuriyama, Masako Kakizaki, Toshimasa Sone, Naoki Nakaya, Kaori Ohmori-Matsuda, Atsushi Hozawa, Yoshikazu Nishino and Ichiro Tsuji

Correspondence to Toru Naganuma, Division of Epidemiology, Department of Public Health and Forensic Medicine, Tohoku University School of Medicine, 2-1 Seiryo-machi Aoba-ku, Sendai, 980-8575 Japan (e-mail: a4mb1075-thk{at}umin.ac.jp).

Received for publication February 5, 2009. Accepted for publication June 5, 2009.

Several biologic studies have reported that green tea constituents have antitumor effects on hematologic malignancies. However, the effects in humans are uncertain. The authors used data from the Ohsaki National Health Insurance Cohort Study in Japan to evaluate the association between green tea consumption and the risk of hematologic malignancies. Study participants were 41,761 Japanese adults aged 40–79 years without a history of cancer at baseline who answered a food frequency questionnaire survey in 1994. During 9 years of follow-up beginning in 1995, the authors documented 157 hematologic malignancies, including 119 cases of lymphoid neoplasms and 36 cases of myeloid neoplasms. Hazard ratios were calculated by using the Cox proportional hazards regression model. Risk of hematologic malignancies was inversely associated with green tea consumption. The multivariate-adjusted hazard ratio of hematologic malignancies for 5 cups/day or more compared with less than 1 cup/day of green tea was 0.58 (95% confidence interval: 0.37, 0.89). The corresponding risk estimate was 0.52 (95% confidence interval: 0.31, 0.87) for lymphoid neoplasms and 0.76 (95% confidence interval: 0.32, 1.78) for myeloid neoplasms. This inverse association was consistent across sex and body mass index strata. In conclusion, green tea consumption was associated with a lower risk of hematologic malignancies.

catechin; cohort studies; hematologic neoplasms; Japan; risk; tea

Abbreviations: EGCG, (-)-epigallocatechin-3-gallate; FFQ, food frequency questionnaire; ICD-O-3, International Classification of Diseases for Oncology, Third Edition; NHI, National Health Insurance


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