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Green Tea Consumption and Stomach Cancer Risk: A Meta-Analysis
Hyunseok Kang, Sun Young Rha, Kyung Won Oh, Chung Mo Nam
Epidemiol Health. 2010;32:e2010001.   Published online April 26, 2010
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>
Summary

Citations

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A Case-Control Study on Risk Factors of CHD: Vegetable consumption and risk for CHD in Korean men.
Kyung Won Oh, Il Suh, Kang Hee lee, Chung Mo Nam, Suk Il Kim, Hyung Gon Kang, Sun Ha Jee, Seung Yun Cho, Won Heum Shim
Korean J Epidemiol. 1998;20(2):234-245.
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AbstractAbstract PDF
Abstract
The purpose of this study was to investigate the association of vegetable consumption with the incidence of CHD in Korean men by a case-control study. The case group consisted of 108 patients with EKG-confirmed myocardial infarct or angiographically-confirmed(>or=50% stenosis) angina pectoris admitted to a university teaching hospital in Seoul, Korea. Controls were 142 age-matched patients admitted to the departments of ophthalmology and orthopedic surgery at the same hospital. Dietary intake was assessed by a nutritionist using a semiquantitative food frequency method, while body mass index (BMI), tobacco use, and past history of cardiovascular disease were determined during an interview and examination. The consumption of vegetables was classified by the average frequency of intake(less than 3 times/week, 3~4 times/week, 5~6 times/week, more than once/day). The percentage of subjects who consumed vegetables less than 3 times per week was 29.6% for cases and 17.6% for controls; while men who consumed vegetavle more than once per day were 16.7% for cases and 32.4% for controls. After the adjustment for age, body mass index, and tobacco use, the odds ratio of men who consumed vegetables at least once per day was 0.38(95% confidence interval, 0.18-0.85) compared with men who consumed vegetables less than three times per week. These results suggested that in a population with a relatively low fat intake, consumption of vegetables at least once per day may reduce the risk of CHD in men.
Summary

Epidemiol Health : Epidemiology and Health