Lower body mass and lower adiposity are associated with differential responses to two treatment strategies for rheumatoid arthritis

Joshua F. Baker, James R. ODell, Bryant R. England, Jon T. Giles, Jefferey A. Newcomb, Michael D. George, Geoffrey Thiele, Larry Moreland, S. Louis Bridges, Jeffrey R. Curtis, Ted R. Mikuls

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose To determine if body mass index (BMI) and adipokine levels identify rheumatoid arthritis (RA) patients most likely to benefit from initiation of tumour necrosis factor inhibitors (TNFi) after methotrexate inadequate response. Methods This is a secondary analysis of the Rheumatoid Arthritis Comparison of Active Treatments (RACAT) trial and the (TEAR) trial. Both studies compared treatment strategies starting with conventional disease-modifying anti-rheumatic drugs (DMARDs) (triple therapy) versus etanercept plus methotrexate. We compared response rates between TNFi and triple therapy among patients with different BMI. Adipokines were measured at enrolment and associations with treatment response were examined using regression, adjusting for age, sex, BMI and baseline disease activity. Results In RACAT (n=306), participants who were normal/underweight were more likely to benefit from TNFi versus triple therapy, with greater change in Disease Activity Score in 28 and greater ACR20 response (ACR 20: 64% vs 23%, p=0.001). In contrast, overweight/ obese participants had similar response to TNFi versus triple therapy (p-for-interaction=0.001). Similarly, but modest patterns were observed in TEAR (n=601; ACR20: 67% vs 52%, p=0.05). In RACAT, adipokine scores consistent with lower adiposity also predicted greater response to TNFi (ACR20: 58% vs 37%, p=0.01) with better model fit compared with BMI alone. Conclusions Lower BMI and evidence of lower adiposity based on adipokine profiles were associated with a superior response to TNFi compared with triple therapy. There was no difference between treatments among overweight/obese participants. The results support TNFi being a particularly important therapeutic among normal/underweight patients, with implications for clinical decisions and trial design.

Original languageEnglish (US)
Pages (from-to)429-436
Number of pages8
JournalAnnals of the rheumatic diseases
Volume83
Issue number4
DOIs
StatePublished - Jan 3 2024

ASJC Scopus subject areas

  • Rheumatology
  • Immunology and Allergy
  • Immunology
  • General Biochemistry, Genetics and Molecular Biology

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