Green tea consumption and the risk of liver cancer in Japan: the Ohsaki Cohort study
To investigate the association between green tea consumption and liver cancer incidence.
We prospectively followed 41,761 Japanese adults aged 40–79 years, without a history of cancer at the baseline or any missing data for green tea consumption frequency. Cox proportional hazards models were used to calculate hazard ratios (HR) with 95% confidence intervals (CI), adjusted for age, alcohol drinking, smoking, the consumption of coffee, vegetables, dairy products, fruit, fish, and soybean.
Over 9 years of follow-up, among 325,947 accrued person-years, the total incidence of liver cancer was 247 cases. We found that green tea consumption was inversely associated with the incidence of liver cancer. In men, the multivariate-adjusted HRs (95% CIs) for liver cancer incidence with different green tea consumption categories were 1.00 (reference) for <1 cup/day, 0.83 (0.53–1.30) for 1–2 cups/day, 1.11 (0.73–1.68) for 3–4 cups/day, and 0.63 (0.41–0.98) for ≥5 cups/day (p for trend = 0.11). The corresponding data among women were 1.00 (reference), 0.68 (0.35–1.31), 0.79 (0.44–1.44), 0.50 (0.27–0.90) (p for trend = 0.04).
Green tea consumption is associated with a reduced risk of liver cancer incidence.
KeywordsLiver cancer Green tea Japanese Incidence
This study was supported by a Grant-in-Aid for Cancer Research and for the Third Term Comprehensive Ten-Year Strategy for Cancer Control (H18-3jigan-ippan-001), Ministry of Health, Labour and Welfare, in Japan. We thank Yoshiko Nakata, Mika Wagatsuma, and Naoko Sato, Division of Epidemiology, Department of Public Health and Forensic Medicine, Tohoku University Graduate School of Medicine, Sendai, Japan, for their technical assistance.
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