Pretreatment synovial transcriptional profile is associated with early and late clinical response in rheumatoid arthritis patients treated with rituximab

Vanessa E Hogan, Cécile T J Holweg, David F Choy, Sarah K Kummerfeld, Jason A Hackney, Y K Onno Teng, Michael J Townsend, Jacob M van Laar

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

OBJECTIVE: Personalised healthcare is contingent on the identification of biomarkers that represent disease relevant pathways and predict drug response. The authors aimed to develop a gene expression signature in synovial tissue that could enrich clinical response of rheumatoid arthritis (RA) patients to rituximab.

METHODS: The authors studied synovial gene expression using high-throughput quantitative real-time-PCR in 20 RA patients who underwent arthroscopy before and after treatment with rituximab. Several objective approaches were used to explore patterns in the data and to find genes associated with changes in disease activity due to treatment.

RESULTS: This analysis revealed two patient populations associated with distinct clinical, laboratory and histological features and, importantly, showed enrichment for response (60% non-responders vs 90% responders). A composite baseline gene score (GS) correlated with change in disease activity score (ΔDAS) between baseline and month 3 (r=0.74, p=0.0002), but also with ΔDAS at later time-points (month 9, r=0.54, p=0.016; month 15, r=0.45, p=0.06; month 21, r=0.72, p=0.003). Notably, the GS significantly correlated with baseline erythrocyte sedimentation rate (r=0.69, p=0.0008), but not with other DAS components. The GS genes represented T cell, macrophage, remodelling and interferon-α biology. Responders demonstrated higher expression of macrophage and T cell genes, while non-responders showed higher expression of interferon-α and remodelling genes.

CONCLUSIONS: This study reveals a baseline synovial GS that correlates with early and late clinical responses to rituximab. The GS biology suggests that T cells and macrophages are important for response to B cell depleting therapy, while expression of remodelling and interferon-α genes correlates with poor response.

Original languageEnglish
Pages (from-to)1888-94
Number of pages7
JournalAnnals of the Rheumatic Diseases
Volume71
Issue number11
DOIs
Publication statusPublished - Nov 2012

Keywords

  • Acetaminophen
  • Adult
  • Antibodies, Monoclonal, Murine-Derived
  • Antirheumatic Agents
  • Arthritis, Rheumatoid
  • Clemastine
  • Drug Therapy, Combination
  • Female
  • Gene Expression Profiling
  • Health Status
  • Humans
  • Immunologic Factors
  • Male
  • Methylprednisolone
  • Middle Aged
  • Rituximab
  • Severity of Illness Index
  • Synovial Membrane
  • Transcriptome
  • Treatment Outcome
  • Journal Article
  • Research Support, Non-U.S. Gov't

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