Secukinumab in Ankylosing Spondylitis Patients: A Cost-per-Responder Analysis from the Indonesian Health System Perspective

Objective There are no publications that have demonstrated economic value for ankylosing spondylitis (AS) treatments in Indonesia. Cost per responder (CPR) is a lean method of economic evaluation. We estimated CPR from Indonesia’s health system perspective following AS treatment with secukinumab relative to adalimumab, golimumab, and infliximab. Methods In the absence of head-to-head trials, a comparative evidence analysis was conducted in the form of matching-adjusted indirect comparison (MAIC) to estimate the response rate of various competing treatment options against secukinumab. This was followed by a CPR analysis that compared the cost per patient for a defined response level. Results Based on MAIC, patients on secukinumab had higher Assessment in Spondyloarthritis International Society (ASAS) 20 response (improvement of ≥ 20% and ≥ 1 unit in at least three domains on a scale of 10 and no worsening of ≥ 20% and ≥ 1 unit in remaining domain on a scale of 10) and ASAS 40 response (improvement of ≥ 40% and ≥ 2 units in at least three domains on a scale of 10 and no worsening at all in remaining domain) versus those on adalimumab, golimumab, and infliximab at week 24. The cost per ASAS 20 at week 24 for secukinumab was 75% lower than adalimumab, 65% lower than golimumab, and 80% lower than infliximab. The cost per ASAS 40 at week 24 for secukinumab was 77% lower than adalimumab, 67% lower than golimumab, and 83% lower than infliximab. Secukinumab dominated adalimumab, golimumab, and infliximab at week 24 and adalimumab at week 52, by being more efficacious at lower cost. Threshold analysis revealed that substantial reduction in efficacy or increase in cost of secukinumab would make secukinumab not cost effective, indicating the robustness of the results. Conclusion This study demonstrated that if AS patients in Indonesia were treated with secukinumab instead of comparator therapies, more patients could be treated, and more patients would reach response to treatment for the same budget.