Serum Levels of Copper and Zinc in Patients with Rheumatoid Arthritis: a Meta-analysis
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Abstract
Many publications with conflicting results have evaluated serum levels of copper (Cu) and zinc (Zn) in patients with rheumatoid arthritis (RA). To derive a more precise estimation of the relationship, a meta-analysis was conducted. Relevant published data were retrieved through PubMed, Chinese National Knowledge Infrastructure (CNKI), and Chinese Biomedical Database (CBM) before September 20, 2014. Weighted mean difference (WMD) with a 95 % confidence interval (95 % CI) was calculated using STATA 11.0. A total of 26 studies, including 1444 RA cases and 1241 healthy controls, were collected in this meta-analysis. Pooled analysis found that patients with RA had a higher serum level of Cu and a lower serum Zn level than the healthy controls (Cu (μg/dl), WMD = 31.824, 95 % CI = 20.334, 43.314; Zn (μg/dl), WMD = −12.683, 95 % CI = −19.783, −5.584). Subgroup analysis showed that ethnicity had influence on the serum level of Cu (μg/dl) (Caucasian, WMD = 43.907, 95 % CI = 35.090, 52.723, P < 0.001; Asian, WMD = 14.545, 95 % CI = −12.365, 41.455, P = 0.289) and Zn (μg/dl) (Caucasian, WMD = −11.038, 95 % CI = −23.420, 1.344, P = 0.081; Asian, WMD = −14.179, 95 % CI = −18.963, −9.394, P < 0.001) in RA and healthy controls. No evidence of publication bias was observed. This meta-analysis suggests that increased serum level of Cu and decreased serum level of Zn are generally present in RA patients.
Keywords
Zinc Copper Rheumatoid arthritis Meta-analysisNotes
Acknowledgments
The study was supported by grants from the National Natural Science Foundation of China (30771849, 30972530, 81273169).
Conflicts of interest
None of the authors has any conflicts of interest to declare.
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