AUTHOR=Xin Caihong , Xie Jing , Fan Huaying , Sun Xin , Shi Bimin 

TITLE=Association Between Serum Cystatin C and Thyroid Diseases: A Systematic Review and Meta-Analysis

JOURNAL=Frontiers in Endocrinology

VOLUME=12

YEAR=2021

URL=https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2021.766516

DOI=10.3389/fendo.2021.766516

ISSN=1664-2392

ABSTRACT=<sec><title>Background</title><p>Cystatin C (CysC) is often used to diagnose and monitor renal diseases. Although some studies have investigated the association between serum CysC levels and thyroid diseases, their reported results were inconsistent. Therefore, the relationship between CysC levels and thyroid diseases remains controversial.</p></sec><sec><title>Aim</title><p>This meta-analysis aimed to statistically evaluate serum CysC levels in patients with thyroid diseases.</p></sec><sec><title>Methods</title><p>A literature search was conducted using the PubMed, Web of Science, Embase, EBSCO, and <ext-link ext-link-type="uri" xlink:href="Wiley Online Library" xmlns:xlink="http://www.w3.org/1999/xlink">Wiley Online Library</ext-link> databases. The following search terms were used for the title or abstract: “Cystatin C” or “CysC” in combination with the terms “thyroid disease”, “thyroid function”, “hypothyroidism”, or “hyperthyroidism”. The results of the systematic analysis were presented as standardized mean differences (SMDs) with corresponding 95% confidence intervals (CIs).</p></sec><sec><title>Results</title><p>Eleven articles (1,265 cases and 894 controls) were included in the meta-analysis. The results of the meta-analysis showed that the serum CysC levels of patients with hyperthyroidism were significantly higher than those of the controls (SMD: 1.79, 95% CI [1.34, 2.25]), and the serum CysC levels of patients with hypothyroidism were significantly lower than those of the controls (SMD −0.59, 95% CI [−0.82, −0.36]). Moreover, the treatment of thyroid diseases significantly affected serum CysC levels.</p></sec><sec><title>Conclusions</title><p>To the best of our knowledge, this meta-analysis is the first to evaluate serum CysC levels in patients with thyroid diseases. Our findings suggest that thyroid function affects serum CysC levels and that serum CysC may be an effective marker for monitoring thyroid diseases.</p></sec><sec><title>Systematic Review Registration</title><p>PROSPERO [<uri xlink:href="https://www.crd.york.ac.uk/PROSPERO/display_record.php?RecordID=258022], identifier CRD42021258022" xmlns:xlink="http://www.w3.org/1999/xlink">https://www.crd.york.ac.uk/PROSPERO/display_record.php?RecordID=258022], identifier CRD42021258022</uri>].</p></sec>