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Circulating VEGF as a biological marker in patients with rheumatoid arthritis? Preanalytical and biological variability in healthy persons and in patients.

Abstract：

BACKGROUND:Soluble vascular endothelial growth factor (VEGF) is a promising biomarker in monitoring rheumatoid arthritis (RA), but studies of pre-analytical and biologic variability are few. METHODS:VEGF was measured by ELISA methods in serum and plasma from healthy persons and RA patients. Pre-analytical factors were investigated. A reference interval for VEGF was established in serum and plasma from 306 healthy persons. Diurnal, day-to-day, week-to-week, long-term variability, and impact of exercise were evaluated. RESULTS:Delayed processing time, room temperature, low centrifugal force and contamination of plasma with cellular elements lead to significant increases in VEGF levels, whereas storage for up to 2 years at -80 degrees C or up to 10 freeze/thaw cycles did not affect VEGF levels. Serum VEGF levels were 7-10 fold higher than plasma VEGF levels. Reference intervals for VEGF (plasma: 45 pg/ml (range: non-detectable to 352); serum: 328 pg/ml (53-1791)) were independent of gender and age. Short- and long-term biologic variability included diurnal variation (sampling should take place after 7 AM) and impact of exercise (increased VEGF immediately after bicycling normalised within 1 hour). CONCLUSIONS:Pre-analytical factors and biologic variability including diurnal variation and impact of exercise should be accounted for in future studies that include circulating VEGF as a biological marker.

journal_name

Dis Markers

journal_title

Disease markers

authors

Hetland ML,Christensen IJ,Lottenburger T,Johansen JS,Svendsen MN,Hørslev-Petersen K,Nielsen L,Nielsen HJ

doi

10.1155/2008/707864

subject

Has Abstract

pub_date

2008-01-01 00:00:00

pages

1-10

issue

1

eissn

0278-0240

issn

1875-8630

journal_volume

24

pub_type

杂志文章

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