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Eur Urol. 2007 Oct;52(4):1052-6. Epub 2007 Feb 5.

Dietary zinc and prostate cancer risk: a case-control study from Italy.

Author information

1
Department of Epidemiology, Istituto di Ricerche Farmacologiche "Mario Negri", Milan, Italy. gallus@marionegri.it

Abstract

OBJECTIVES:

Zinc concentration is higher in the prostate than in most other tissues. Since information on the role of zinc on prostate carcinogenesis is controversial, we analysed the issue in a case-control study.

METHODS:

Between 1991 and 2002, we conducted a multicentre hospital-based case-control study on prostate cancer in Italy. Cases included 1294 men with incident, histologically confirmed prostate cancer. Controls included 1451 patients admitted to the same hospitals as cases for a wide spectrum of acute non-neoplastic, non-hormone-related diseases. Zinc intake was computed from a valid and reproducible food frequency questionnaire, with the use of an Italian food composition database. Odds ratios (OR) of dietary intake of zinc and the corresponding 95% confidence intervals (CI) were estimated by unconditional multiple logistic regression models, after allowance for several covariates, including total energy.

RESULTS:

Compared with the lowest quintile, the OR for the highest quintile was 1.56 (95% CI, 1.07-2.26), with a significant trend in risk (p=0.04). The trend in risk was significant for advanced cancers only, the OR being 2.02 (95% CI, 1.14-3.59) for prostate cancers with a high Gleason score.

CONCLUSIONS:

In this large study we found a direct association between high zinc intake and prostate cancer risk, particularly for advanced cancers. Our findings allow one to exclude a favourable effect of zinc on prostate carcinogenesis.

PMID:
17292532
DOI:
10.1016/j.eururo.2007.01.094
[Indexed for MEDLINE]
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