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Biomarkers predict radiographic progression in early rheumatoid arthritis and perform well compared with traditional markers

Lookup NU author(s): Dr Steven Young-Min, Emeritus Professor Tim Cawston, Dr David Coady

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Abstract

Objective. To evaluate the performance of biochemical and traditional markers in predicting radiographic progression in rheumatoid arthritis (RA). Methods. One hundred thirty-two patients with early RA were treated with nonbiologic therapies for 2 years and studied longitudinally. Genomic DNA was analyzed for presence of the shared epitope. Levels of matrix metalloproteinases (matrix metalloproteinase I [MMP-1], MMP-13, and MMP-3), tissue inhibitor of metalloproteinases I (TIMP-1), and cartilage oligomeric matrix protein (COMP) were assessed in serially obtained serum samples. The presence of pyridinoline (Pyr), deoxypyridinoline, glycosylated Pyr (Glc-Gal-Pyr), and C-telopeptide of type 11 collagen (CTX-II) was assessed in urine samples. Radiographs obtained at entry and at 2 years were evaluated using the modified Larsen score. Results. Baseline and 2-year radiographs were available from 118 patients. Larsen scores worsened during the 2 years in 50 patients, while 68 patients had no radiographic progression. Levels of a variety of biochemical markers, i.e., MMP-3, CTX-II, COMP, TIMP-1, Pyr, and Gic-Gal-Pyr, correlated significantly with radiographic progression at entry and longitudinally as assessed by area under the curve (AUC). By multivariate analysis, a model including MMP-3 and CTX-II was identified as providing the best prediction of radiographic progression at entry (predictive accuracy by receiver operating characteristic [ROC] AUC = 0.76 [95% confidence interval 0.66-0.85]), while a combination of MMP-3, CTX-II, and swollen joint count formed the best longitudinal AUC model (predictive accuracy by ROC AUC = 0.81 [95% confidence interval 0.73-0.89]). Patient-reported measures (Health Assessment Questionnaire, pain scores) were of limited use. In a subset of 50 patients who were treated with methotrexate (MTX) during the followup period, median serum MMP-3 levels decreased after the initiation of MTX therapy (P 0.0003). Conclusion. These results indicate that biochemical markers are useful predictors of radiographic progression in RA and that serum MMP-3 levels decrease significantly with MTX therapy. Multivariate models that include MMP-3 and CTX-II perform better than existing traditional markers in predicting radiographic outcome in RA.


Publication metadata

Author(s): Young-Min SA, Cawston TE, Marshall N, Coady DA, Christgau S, Saxne T, Robins S, Griffiths I

Publication type: Article

Publication status: Published

Journal: Arthritis & Rheumatism

Year: 2007

Volume: 56

Issue: 10

Pages: 3236-3247

ISSN (print): 0004-3591

ISSN (electronic): 1529-0131

Publisher: John Wiley & Sons, Inc.

URL: http://dx.doi.org/10.1002/art.22923

DOI: 10.1002/art.22923


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