Coffee May Reduce Risk of Liver Cancer

TOKYO—Coffee consumption may reduce the risk of liver cancer regardless of hepatitis C (HCV) and B virus (HBV) infection status, whereas green tea may not reduce this risk (Cancer Epidemiol Biomarkers Prev 2009;18(6):1746–53). Researchers examined whether coffee and green tea consumption was associated with a reduced risk of liver cancer by hepatitis virus infection status in the Japan Public Health Center-Based Prospective Study Cohort II. A total of 18,815 subjects ages 40 to 69 years participating in a questionnaire and health checkup survey in 1993 to 1994 were followed for the incidence of liver cancer through 2006. A total of 110 cases of liver cancer were newly documented. Hazard ratios for coffee and green tea consumption categories were calculated with a Cox proportional hazards model. Compared with almost never drinkers, increased coffee consumption was associated with a reduced risk of liver cancer in all subjects. A similar risk tendency was observed in those with either or both HCV and HBV infection. In contrast, no association was observed between green tea consumption and the risk of liver cancer in all subjects.