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Reliability of serum biomarkers of inflammation from repeated measures in healthy individuals.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Navarro, Sandi L. Brasky, Theodore M. Schwarz, Yvonne Song, Xiaoling Wang, C. Y. Kristal, Alan R. Kratz, Mario White, Emily Lampe, Johanna W.
Description	Country affiliation: United States Author Affiliation: Navarro SL ( Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA. snavarro@fhcrc.org)
Abstract	BACKGROUND: Biomarkers of low-grade systemic inflammation are used to study the associations of inflammation with chronic diseases, including cancer. However, relatively little is known about the intraindividual variability of most of these measures. METHODS: Fasting serum samples, collected at baseline and the end of ≥3-week washout periods in a four-diet crossover feeding trial, were used to measure the inflammatory markers high sensitivity C-reactive protein (hsCRP), interleukin (IL)-6, tumor necrosis factor (TNF)- , IL-8, and soluble TNF receptor (sTNFR) I and II. Participants included 62 men and women for analyses of IL-6 and CRP and 56 for analyses of IL-8, TNF- , and sTNFRs, aged 20 to 40, who were free of factors known to influence inflammation, for example, chronic disease, medication use, heavy alcohol use, smoking, and obesity (body mass index >30 kg/m(2)). Intraclass correlations (ICC) were estimated using random effects ANOVA, across all four time points (~6 weeks apart). RESULTS: ICCs for TNF- and sTNFR I and II were very high: ICC = 0.92 [95% confidence interval (CI), 0.89-0.96], 0.92 (95% CI, 0.88-0.95), and 0.90 (95% CI, 0.85-0.94), respectively. ICCs for IL-8 and hsCRP were 0.73 (95% CI, 0.63-0.83) and 0.62 (95% CI, 0.49-0.75), respectively. The ICC for IL-6 was considerably lower, ICC = 0.48 (95% CI, 0.36-0.62). Three measures of IL-6 would be needed to achieve a reliability coefficient (Cronbach ) of 0.75. CONCLUSIONS: With the exception of IL-6, reliability of all inflammatory markers in our panel was high. IMPACT: This suggests that a single measure accurately captures the short-term (e.g., 4-6 months) variability within an individual.
File Format	HTM / HTML
ISSN	10559965
e-ISSN	15387755
DOI	10.1158/1055-9965.EPI-12-0110
Journal	Cancer Epidemiology Biomarkers & Prevention
Issue Number	7
Volume Number	21
Language	English
Publisher	American Association for Cancer Research
Publisher Date	2012-07-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Discipline Cancer epidemiology Biological Markers Blood C-reactive Protein Metabolism Inflammation Diagnosis Interleukin-6 Interleukin-8 Tumor Necrosis Factor-alpha Prognosis Research Support, N.i.h., Extramural
Content Type	Text
Resource Type	Article
Subject	Epidemiology Oncology

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