Abstract
INTRODUCTION: Patients with ankylosing spondylitis (AS) are burdened with symptoms impacting work productivity measured by presenteeism, absenteeism, overall work impairment, and activity impairment. Ixekizumab, a high-affinity monoclonal antibody selectively targeting interleukin-17A, has been demonstrated to improve disease signs and symptoms in two phase 3 trials of AS. This study investigated for 52 weeks the effect of ixekizumab treatment on work productivity in patients with active AS. METHODS: COAST-V (NCT02696785) and COAST-W (NCT02696798) were phase 3, multicenter, randomized, controlled trials investigating the efficacy of ixekizumab 80 mg every 4 weeks (Q4W) and every 2 weeks (Q2W) in patients with AS naïve to biologic disease-modifying antirheumatic drugs (bDMARDs; COAST-V) or who were inadequate responders or intolerant to tumor necrosis factor inhibitors (TNFi; COAST-W). Work productivity was measured with the Work Productivity and Activity Impairment Questionnaire for Spondyloarthritis at weeks 16 and 52. Absenteeism, presenteeism, and overall work impairment were assessed for patients reporting paid work. Activity impairment was assessed regardless of work status. RESULTS: At baseline, 66.2% (434/656) of patients reported paid work. At week 16, bDMARD-naïve patients treated with both ixekizumab dose regimens and TNFi-experienced patients treated with ixekizumab Q2W reported significant improvements in activity impairment (p < 0.01 and p < 0.05, respectively). TNFi-experienced patients treated with ixekizumab showed significant improvements versus placebo in presenteeism and overall work impairment (p < 0.05); bDMARD-naïve patients had numeric improvements. After week 16, patients initially on placebo switched to ixekizumab and patients already treated with ixekizumab continued treatment. Improvements in work productivity and daily activity were sustained through week 52 for both bDMARD-experienced and -naïve patients. CONCLUSION: Both bDMARD-naïve and TNFi-experienced patients with AS had greater improvements in work productivity and activity impairment when receiving ixekizumab compared to placebo at week 16. Improvements in work productivity and activity impairment achieved at week 16 were sustained through week 52 with ixekizumab treatment.