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Clinical Significance of Elevated Serum Immunoglobulin G4 Levels in Patients With Rheumatoid Arthritis

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Author(s)
Sang-Hyon KimHye-Jin JeongJi-Min KimJae-Bum JunChang-Nam Son
Publication Year
2020
Keyword
Rheumatoid arthritisImmunoglobulin G4
Abstract
Objective:
This study aimed to evaluate the relationship between serum immunoglobulin G4 (IgG4) levels and the presence and disease activity of rheumatoid arthritis (RA).

Methods:
The study enrolled 128 participants (RA, 96; healthy controls, 17; osteoarthritis, 11; and IgG4-related disease, 4) between March 2014 and July 2017. Blood samples were collected prior to the commencement of treatment, and serum IgG4 levels were determined using a nephelometric assay (levels ≥135 mg/dL were considered elevated). The levels of serum IgG4 and the ratio of IgG4/total IgG in patients with RA were compared with those in healthy controls, patients with osteoarthritis, and patients with IgG4-related disease. Furthermore, the relationship between serum IgG4 levels and RA disease activity was evaluated.

Results:
Among the 96 patients with RA, the mean (±standard deviation) serum IgG4 level was 48.0±45.4 mg/dL; 6 (6.3%) patients had elevated serum IgG4 levels. However, none of the healthy controls or patients with osteoarthritis had elevated serum IgG4 levels. The mean serum IgG4/IgG ratio in patients with RA was 3.5%±2.8% (range, 0.2%~16.9%). Using Spearman's correlation coefficient analysis, a significant correlation was found between serum IgG4 levels and the Disease Activity Score-28 with erythrocyte sedimentation rate (r, 0.245; p=0.016).

Conclusion:
There was an increased frequency of elevated serum IgG4 levels in patients with RA, and the levels were correlated with RA disease activity.
Alternative Title
Clinical Significance of Elevated Serum Immunoglobulin G4 Levels in Patients With Rheumatoid Arthritis
Department
Dept. of Internal Medicine (내과학)
Publisher
School of Medicine (의과대학)
Citation
대한류마티스학회지, Vol.27(2) : 96-99, 2020
Type
Article
ISSN
2233-4718
DOI
10.4078/jrd.2020.27.2.96
URI
http://kumel.medlib.dsmc.or.kr/handle/2015.oak/42698
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