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Prospective cohort study of green tea consumption and colorectal cancer risk in women

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By G Yang, et al. • www.ProHealth.com • June 25, 2007


Journal: Cancer Epidemiology, Biomarkers and Prevention. 2007 June;16(6):1219-23

Authors and affiliation: Yang G, Shu XO, Li H, Chow WH, Ji BT, Zhang X, Gao YT, Zheng W. Vanderbilt University Medical Center, Nashville, Tennessee. USA. [E-mail: Gong.Yang@vanderbilt.edu ]

PMID: 17548688

Tea and its constituents have shown anticarcinogenic activities in invitro and animal studies. Epidemiologic studies, however, have been inconsistent. We prospectively evaluated the association between green tea consumption and colorectal cancer (CRC) risk in a cohort of 69,710 Chinese women aged 40 to 70 years.

Information on tea consumption was assessed through in-person interviews at baseline and reassessed 2 to 3 years later in a follow-up survey.

During 6 years of follow-up, 256 incident cases of CRC were identified. The multivariate relative risk of CRC was 0.63 (95% confidence interval, 0.45-0.88) for women who reported drinking green tea regularly at baseline compared with nonregular tea drinkers. A significant dose-response relationship was found for both the amount of tea consumed (P (trend) = 0.01) and duration in years of lifetime tea consumption (P (trend) = 0.006).

The reduction in risk was most evident among those who consistently reported to drink tea regularly at both the baseline and follow-up surveys (relative risk, 0.43; 95% confidence interval, 0.24-0.77).

The inverse association with regular tea drinking was observed for both colon and rectal cancers. This study suggests that regular consumption of green tea may reduce CRC risk in women.





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