High levels of interleukin-6 in patients with rheumatoid arthritis are associated with greater improvements in health-related quality of life for sarilumab compared with adalimumab.
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ABSTRACT: BACKGROUND:Increased levels of cytokines, including interleukin-6 (IL-6), reflect inflammation and have been shown to be predictive of therapeutic responses, fatigue, pain, and depression in patients with rheumatoid arthritis (RA), but limited data exist on associations between IL-6 levels and health-related quality of life (HRQoL). This post hoc analysis of MONARCH phase III randomized controlled trial data evaluated the potential of baseline IL-6 levels to differentially predict HRQoL improvements with sarilumab, a fully human monoclonal antibody directed against both soluble and membrane-bound IL-6 receptor ? (anti-IL-6R?) versus adalimumab, a tumor necrosis factor ? inhibitor, both approved for treatment of active RA. METHODS:Baseline serum IL-6 levels in 300/369 randomized patients were categorized into low (1.6-7.1?pg/mL), medium (7.2-39.5?pg/mL), and high (39.6-692.3?pg/mL) tertiles. HRQoL was measured at baseline and week (W)24 and W52 by Short Form 36 (SF-36) physical/mental component summary (PCS/MCS) and domain scores, Functional Assessment of Chronic Illness Therapy -fatigue, and duration of morning stiffness visual analog scale (AM-stiffness VAS). Linear regression of changes from baseline in HRQoL (IL-6 tertile, treatment, region as a stratification factor, and IL-6 tertile-by-treatment interaction as fixed effects) assessed predictivity of baseline IL-6 levels, with low tertile as reference. Pairwise comparisons of improvements between treatment groups were performed by tertile; least squares mean differences and 95% CIs were calculated. Similar analyses evaluated W24 patient-level response on minimum clinically important differences (MCID). RESULTS:At baseline, patients with high versus medium or low IL-6 levels (n?=?100, respectively) reported worse (nominal p?
SUBMITTER: Strand V
PROVIDER: S-EPMC7574446 | biostudies-literature | 2020 Oct
REPOSITORIES: biostudies-literature
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