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  • Title: Ixekizumab in radiographic axial spondyloarthritis with and without elevated C-reactive protein or positive magnetic resonance imaging.
    Author: Maksymowych WP, Bolce R, Gallo G, Seem E, Geneus VJ, Sandoval DM, Østergaard M, Tada K, Baraliakos X, Deodhar A, Gensler LS.
    Journal: Rheumatology (Oxford); 2022 Nov 02; 61(11):4324-4334. PubMed ID: 35188180.
    Abstract:
    OBJECTIVE: To evaluate response rates at week 16 with ixekizumab in patients with radiographic axial SpA (r-axSpA) and elevated or normal/low baseline inflammation measured by serum CRP or spinal MRI using data from two randomized, double-blind, placebo (PBO)-controlled phase III trials. METHODS: Biologic-naïve (COAST-V) or TNF inhibitor-experienced (COAST-W) adults with active r-axSpA received 80 mg ixekizumab every 2 weeks (IXEQ2W) or 4 weeks (IXEQ4W) or PBO or active reference [40 mg adalimumab every 2 weeks (ADAQ2W) in COAST-V. At week 16, patients receiving ixekizumab continued as assigned and patients receiving PBO or ADA were rerandomized 1:1 to IXEQ2W or IXEQ4W through week 52. Assessment of SpondyloArthritis international Society 40% (ASAS40) response rates were examined by baseline CRP (≤5 or >5 mg/l) and Spondyloarthritis Research Consortium of Canada (SPARCC) MRI spine inflammation score (<2 or ≥2). RESULTS: In the COAST-V/W integrated dataset (N = 567), significantly more patients treated with ixekizumab achieved ASAS40 response at week 16 by CRP ≤5 mg/l (27% IXEQ4W, P < 0.05; 35% IXEQ2W, P < 0.01 vs 12% PBO), CRP >5 mg/l (39% IXEQ4W, P < 0.001; 43% IXEQ2W, P < 0.001 vs 17% PBO), SPARCC MRI spine score <2 (40% IXEQ4W P < 0.01, 52% IXEQ2W P < 0.001 vs 16% PBO), and SPARCC MRI spine score ≥2 (44% IXEQ4W P < 0.001, 47% IXEQ2W P < 0.001 vs 19% PBO). ASAS40 response was observed with CRP ≤5 mg/l and SPARCC MRI spine score <2 with IXEQ4W (29%) and was significant with IXEQ2W (48%; P < 0.05) vs PBO (13%). CONCLUSION: Ixekizumab demonstrated efficacy in the treatment of AS/r-axSpA in patients with and without elevated CRP or evidence of spinal inflammation on MRI. TRIAL REGISTRATION: ClinicalTrials.gov (https://clinicaltrials.gov): NCT02696785, NCT02696798.
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