Multibiomarker disease activity score and C-reactive protein in a cross-sectional observational study of patients with rheumatoid arthritis with and without concomitant fibromyalgia

Yvonne C. Lee*, James Hackett, Michelle Frits, Christine K. Iannaccone, Nancy A. Shadick, Michael E. Weinblatt, Oscar G. Segurado, Eric H. Sasso

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

Objectives. To examine the association between a multibiomarker disease activity (MBDA) score, CRP and clinical disease activity measures among RA patients with and without concomitant FM. Methods. In an observational cohort of patients with established RA, we performed a cross-sectional analysis comparing MBDA scores with CRP by rank correlation and cross-classification. MBDA scores, CRP and clinical measures of disease activity were compared between patients with RA alone and RA with concomitant FM (RA and FM) by univariate and multivariate analyses. Results. CRP was ≤1.0 mg/dl for 184 of 198 patients (93%). MBDA scores correlated with CRP (r = 0.755, P < 0.001), but were often discordant, being moderate or high for 19%, 55% and 87% of patients with CRP ≤0.1, 0.1 to ≤0.3, or 0.3 to ≤1.0 mg/dl, respectively. Among patients with CRP ≤1.0 mg/dl, swollen joint count (SJC) increased linearly across levels of MBDA score, both with (P = 0.021) and without (P = 0.004) adjustment for CRP, whereas CRP was not associated with SJC. The 28-joint-DAS-CRP, other composite measures, and their non-joint-count component measures were significantly greater for patients with RA and FM (n = 25) versus RA alone (n = 173) (all P ≤ 0.005). MBDA scores and CRP were similar between groups. Conclusion. MBDA scores frequently indicated RA disease activity when CRP did not. Neither one was significantly greater among patients with RA and FM versus RA alone. Thus, MBDA score may be a useful objective measure for identifying RA patients with active inflammation when CRP is low (≤1.0 mg/dl), including RA patients with concomitant FM.

Original languageEnglish (US)
Article numberkev388
Pages (from-to)640-648
Number of pages9
JournalRheumatology (United Kingdom)
Volume55
Issue number4
DOIs
StatePublished - Apr 1 2016

Keywords

  • Biomarkers
  • C-reactive protein
  • Disease activity
  • Fibromyalgia
  • Multibiomarker
  • RAPID3
  • Rheumatoid arthritis

ASJC Scopus subject areas

  • Pharmacology (medical)
  • Rheumatology

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