OBJECTIVE
To evaluate the effect of ixekizumab on self-reported functioning and health in patients with active non-radiographic axial spondyloarthritis (nr-axSpA).
METHODS
COAST-X is a randomized, controlled trial conducted in patients with nr-axSpA of 52-weeks duration. Participants were randomized 1:1:1 to receive subcutaneous 80 mg ixekizumab every 4 weeks (Q4W) or every 2 weeks (Q2W), or placebo for 52 Weeks. Self-reported functioning and health endpoints included the Medical Outcomes Study 36-Item Short Form Health Survey 36-item (SF-36), Assessment of SpondyloArthritis international Society Health Index (ASAS HI), and European Quality of Life-5 Dimensions-5 Level (EQ-5D-5L) health-utility.
RESULTS
Compared with placebo, ixekizumab treatment improved SF-36 Physical Component Summary scores from baseline (4.7 versus 8.9 IXE Q4W, p<0.05, 9.3 IXE Q2W, p<0.01), with greatest improvements observed in Physical Functioning, Role-physical and Bodily Pain domains at Weeks 16 and 52. Higher proportion of patients receiving ixekizumab reported ASAS HI improvements ≥3 from baseline at Weeks 16 (Q2W, p<0.05) and 52 (p<0.05). Significantly more patients on ixekizumab reported improvements in ASAS HI "good health status" (ASAS HI ≤5) at Weeks 16 (Q4W, p<0.05) and 52 (p<0.05). Patients on ixekizumab reported improvements in EQ-5D-5L versus placebo at Week 16 (0.11 versus 0.17 Q4W, 0.19 Q2W, p<0.05), which remained consistent at Week 52. There were no clinical meaningful differences in responses based on the ixekizumab dosing regimen (Q2W or Q4W).
CONCLUSION
Ixekizumab was superior to placebo improving self-reported functioning and health in patients with nr-axSpA at Weeks 16 and 52.