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15 March 2015 : Meta-Analysis  

Association between Dietary Cadmium Exposure and Breast Cancer Risk: An Updated Meta-Analysis of Observational Studies

Xiujuan WuABCDEF, Xiaofeng ZhuBDEF, Mingjun XieADG

DOI: 10.12659/MSM.892743

Med Sci Monit 2015; 21:769-775

Abstract

BACKGROUND: Diet is the primary way cadmium (Cd) enters the body in those without occupational exposure and who do not inhabit Cd-polluted regions. Findings on the relationship between dietary Cd exposure and breast cancer (BC) risk have been inconsistent; a meta-analysis has supported this association but 2 recent cohort studies showed inconsistent results. Hence, we performed an updated meta-analysis to re-evaluate the association between dietary Cd exposure and BC risk.

MATERIAL AND METHODS: We searched PubMed, Medline, and EMBASE to identify relevant studies published through September 2014. Combined relative risks (RRs) and the corresponding 95% confidence intervals (CIs) were used to assess the association between dietary Cd exposure and BC risk.

RESULTS: We identified 6 studies involving 321 315 participants and 11 978 cases. Our study suggested there was no statistically significant positive association between dietary Cd exposure and BC risk, the combined RR and corresponding 95% CI was 1.01 [0.88, 1.14]. The result was not modified by menopause status, geographic area, or study design.

CONCLUSIONS: Our study did not find a statistically significant positive association between dietary Cd exposure and BC risk. It is necessary to investigate this relationship among the high-risk groups and more cohort studies based on diverse populations are needed.

Keywords: Breast Neoplasms - etiology, Cadmium - adverse effects, Diet - adverse effects, Observational Studies as Topic, Publication Bias, Risk Factors

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DOI: 10.12659/MSM.937927

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Medical Science Monitor eISSN: 1643-3750
Medical Science Monitor eISSN: 1643-3750