Title

Reproducibility of serum cytokines and growth factors

DOI

10.1016/j.cyto.2008.10.014

Document Type

Journal Article

Publication Date

1-1-2009

Publication Title

Cytokine

Volume

45

Issue

1

First Page

44

Last Page

49

ISSN

10434666

Keywords

C-reactive protein, Cytokines, Growth factors, Interleukins, Reproducibility

Abstract

Background: In most studies, circulating biomarkers are usually assessed from a single sample, assuming that this single measurement represents the long-term biomarker status of the individual. Such an assumption is rarely tested although it may not be valid for all biomarkers. The objective of this study was to investigate the temporal reproducibility of a panel of cytokines and growth factors. Methods: Thirty-five postmenopausal women with two annual visits and 30 premenopausal women with three annual visits were randomly selected from the participants in an existing prospective cohort. A total of 23 serum cytokines, nine growth factors and C-reactive protein (CRP) were measured using the Luminex xMap™ technology. In addition, for eight biomarkers, regular and high sensitivity (hs) assays were compared. Results: The biomarkers with adequate (>60%) detection rates and acceptable (≥0.55) intra-class correlation coefficients (ICCs) were: hsIL-1β, IL-1RA, hsIL-2, hsIL-4, hsIL-5, hsIL-6, hsIL-10, IL-12p40, hsIL-12p70, hsTNF-α, TNF-R1, TNF-R2, CRP, HGF, NGF, and EGFR. The remaining biomarkers either had low temporal reproducibility or were undetectable in more than 40% of samples. Conclusions: The results suggest that 16 of the 41 biomarkers measured with Luminex technology showed sufficient sensitivity and temporal reproducibility in sera. © 2008 Elsevier Ltd. All rights reserved.

Open Access

Green Accepted

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