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01.12.2014 | Review | Ausgabe 1/2014 Open Access

World Journal of Surgical Oncology 1/2014

Tea consumption and prostate cancer: an updated meta-analysis

Zeitschrift:
World Journal of Surgical Oncology > Ausgabe 1/2014
Autoren:
Yi-wei Lin, Zheng-hui Hu, Xiao Wang, Qi-qi Mao, Jie Qin, Xiang-yi Zheng, Li-ping Xie
Wichtige Hinweise

Electronic supplementary material

The online version of this article (doi:10.​1186/​1477-7819-12-38) contains supplementary material, which is available to authorized users.

Competing interests

The authors declare that they have no competing interests.

Authors’ contributions

YL and ZH performed statistical analysis and wrote the manuscript; XW and QM performed literature search and stratified the data; JQ and XZ provided meaningful discussion key points; LX revised and edited the manuscript. All authors read and approved the final manuscript.

Abstract

Objectives

Tea is supposed to have chemopreventive effect against various cancers. However, the protective role of tea in prostate cancer is still controversial. The aim of this study is to elucidate the association between tea consumption and prostate cancer risk by meta-analysis.

Methods

A total of 21 published articles were retrieved via both computerized searches and review of references. Estimates of OR/RR for highest versus non/lowest tea consumption levels were pooled on the basis of random effect model or fixed effect model as appropriate. Stratified analyses on tea type, population and study design were also conducted.

Results

No statistical significance was detected between tea consumption and prostate cancer risk in meta-analysis of all included studies (odds ratio (OR) = 0.86, 95% CI (0.69-1.04)). Furthermore, stratified analyses on population (Asian, OR = 0.81, 95% CI (0.55-1.08); non-Asian, OR = 0.89, 95% CI (0.72-1.07)) and tea type (green tea, OR = 0.79, 95% CI (0.43-1.14); black tea, OR = 0.88, 95% CI (0.73-1.02)) also yielded non-significant association. Only the case–control study subgroup demonstrated a borderline protective effect for tea consumption against prostate cancer (OR = 0.77, 95% CI (0.55-0.98)).

Conclusion

Our analyses did not support the conclusion that tea consumption could reduce prostate cancer risk. Further epidemiology studies are needed.
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