Green tea (Camellia sinensis) and cancer prevention: a systematic review of randomized trials and epidemiological studies.

ABSTRACT:

Background

Green tea is one of the most popular beverages worldwide. This review summarizes the beneficial effects of green tea on cancer prevention.

Methods

Electronic databases, including PubMed (1966-2008), the Cochrane Library (Issue 1, 2008) and Chinese Biomedical Database (1978-2008) with supplement of relevant websites, were searched. There was no language restriction. The searches ended at March 2008. We included randomized and non-randomized clinical trials, epidemiological studies (cohort and case-control) and a meta-analysis. We excluded case series, case reports, in vitro and animal studies. Outcomes were measured with estimation of relative risk, hazard or odd ratios, with 95% confidence interval.

Results

Forty-three epidemiological studies, four randomiz

SUBMITTER: Liu J 

PROVIDER: S-EPMC2577676 | biostudies-literature | 2008 Oct

REPOSITORIES: biostudies-literature