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Eur J Clin Nutr. 2014 Mar;68(3):330-7. doi: 10.1038/ejcn.2013.256. Epub 2013 Dec 4.

Coffee consumption and risk of prostate cancer: an up-to-date meta-analysis.

Author information

1
Center of Clinical Laboratory Science, Jiangsu Cancer Hospital Affiliated to Nanjing Medical University, Nanjing, China.
2
The Fourth Clinical College of Nanjing Medical University, Nanjing, China.
3
Department of Hematology (Key Department of Jiangsu Medicine), Zhongda Hospital, Medical School, Southeast University, Nanjing, China.
4
Department of General Surgery, The Affiliated Hospital of Xuzhou Medical College, Xuzhou, China.
5
Teaching and Research Office of General Surgery, Xuzhou Medical College, Xuzhou, China.

Abstract

BACKGROUND/OBJECTIVES:

Epidemiologic findings concerning the association between coffee consumption and prostate cancer risk yielded mixed results. We aimed to investigate the association by performing a meta-analysis of all available studies.

SUBJECTS/METHODS:

We searched PubMed, Web of Science and EMBASE for studies published up to July 2013. We calculated the summary relative risk (RR) and 95% confidence intervals (CIs) for ever, moderate and highest consumption of coffee vs non/lowest consumption. The dose-response relationship was assessed by restricted cubic spline model and multivariate random-effect meta-regression.

RESULTS:

A total of 12 case-control studies and 12 cohort studies with 42,179 cases were selected for final meta-analysis. No significant associations were found among overall analysis. A borderline positive association was found for highest drinkers in five small hospital-based case-control (HCC) studies involving 2278 cases. However, compared with non/lowest drinkers, the summary RRs were 0.92 (95% CI=0.85-0.99) for ever drinkers, 0.92 (95% CI=0.85-1.00) for moderate drinkers and 0.83 (95% CI=0.72-0.96) for highest drinkers from 12 cohort studies, comprising a total of 34,424 cases. An increase in coffee intake of two cups/day was associated with a 7% decreased risk of prostate cancer according to cohort studies. A significant inverse relationship was also found for fatal prostate cancers and high-grade prostate cancers.

CONCLUSIONS:

Case-control studies especially HCC ones might be prone to selection bias and recall bias that might have contributed to the conflicting results. Therefore, the present meta-analysis suggests a borderline significant inverse association between coffee consumption and prostate cancer risk based on cohort studies.

PMID:
24300907
DOI:
10.1038/ejcn.2013.256
[Indexed for MEDLINE]
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