As numerous animal studies have shown that catechins as the main flavonoids presented in green tea are the active constituent for the anticancer activity, a hypothesis has been consistently suggested that green tea consumption would decrease the risk of stomach cancer [1]. In March 2020, Filippini et al. [2] reported results of a Cochrane Database of Systematic Review titled “Green tea (Camellia sinensis) for the prevention of cancer.” The report showed no statistical significance of the association between green tea consumption and stomach cancer risk based on the result of meta-analysis from seven population-based cohort studies (summary relative risk [sRR], 0.99; 95% confidence interval [CI], 0.85 to 1.14). The authors concluded that “a beneficial effect of green tea consumption on (stomach) cancer prevention remains unproven so far.”
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