The Phase III FUTURE I and II trials demonstrated the clinical efficacy of secukinumab in active psoriatic arthritis (PsA). In the absence of head-to-head trials, this study compared the clinical efficacy and cost effectiveness of adalimumab 40 mg versus secukinumab 150 and 300 mg for the treatment of active PsA.
A matching-adjusted indirect comparison was conducted using individual patient data from the ADEPT trial of adalimumab and published data from FUTURE I and II. To adjust for the cross-trial differences, individual patients in ADEPT were re-weighted so that the mean baseline characteristics (including age, weight, gender, race, baseline methotrexate use, psoriasis ≥3% body surface area, baseline PASI score, presence of dactylitis and enthesitis, and HAQ-DI) matched those in the FUTURE trials. Response rates relative to placebo and incremental costs per responder (CPR) over 24 weeks for ACR 20/50/70 and PASI 75/90 were compared between adalimumab and secukinumab 150 and 300 mg from the German social health insurance (SHI) perspective.
After matching, mean baseline characteristics were balanced across the ADEPT and the FUTURE I and II populations. The mean differences between adalimumab and secukinumab 150 mg in relative ACR 20/50/70 and PASI 75/90 response rates were 9.5, 3.0, 6.0, 13.1, and 6.7%, respectively (
p > 0.05 for all comparisons). Post-match relative ACR 20/50/70 and PASI 75 to placebo were also higher with adalimumab compared to secukinumab 300 mg. Adalimumab had lower incremental costs per responder over 24 weeks for all outcomes compared with secukinumab 150 and 300 mg.
In the absence of direct comparisons between adalimumab and secukinumab, this study provides valuable and reliable evidence for physicians and payers. After adjusting for cross-trial differences in baseline characteristics, adalimumab was associated with higher relative ACR and PASI rates and lower incremental CPRs compared with secukinumab 150 mg or 300 mg at week 24 among patients with active PsA.