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Green Tea Consumption and Stomach Cancer Risk: A Meta-Analysis
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Hyunseok Kang, Sun Young Rha, Kyung Won Oh, Chung Mo Nam
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Epidemiol Health. 2010;32:e2010001. Published online April 26, 2010
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DOI: https://doi.org/10.4178/epih/e2010001
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Abstract
<sec><title>OBJECTIVES</title><p>Green tea has been suggested to have a chemopreventive effect against various cancers including stomach cancer. The aim of this study is to elucidate the relationship between green tea consumption and stomach cancer risk by meta-analysis.</p></sec><sec><title>METHODS</title><p>Eighteen observational studies were identified using MEDLINE, THE COCHRANE LIBRARY, RISS, and a manual search. Summary relative risks/odds ratios (RR/ORs) for the highest versus non/lowest green tea consumption levels were calculated on the basis of fixed and random effect models. Subgroup analyses were used to examine heterogeneity across the studies.</p></sec><sec><title>RESULTS</title><p>The combined results indicate a reduced risk of stomach cancer with intake of green tea (RR/OR=0.86, 95% CI=0.74-1.00). Subgroup analysis with six studies that reported differences between the highest and lowest consumption levels equal to or greater than five cups/day revealed a statistically significant protective effect (RR/OR=0.68, 95% CI=0.53-0.87).</p></sec><sec><title>CONCLUSION</title><p>Green tea appears to play a protective role against the development of stomach cancer. The results also suggest that a higher level of green tea consumption might be needed for a clear preventive effect to appear. This conclusion, however, should be interpreted with caution because various biases can affect the results of a meta-analysis.</p></sec>
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