Long-Term Efficacy and Safety of Risankizumab in Patients with Active Psoriatic Arthritis: Results from a 76-Week Phase 2 Randomized Trial

Introduction The objective of this work was to assess the efficacy and safety of risankizumab in psoriatic arthritis (PsA) over 76 weeks. Methods In this double-blind, dose-ranging phase 2 study, adults with active PsA were randomized 2:2:2:1:2 to risankizumab 150 mg at weeks 0, 4, 8, 12, and 16 (arm 1), 150 mg at weeks 0, 4, and 16 (arm 2), 150 mg at weeks 0 and 12 (arm 3), 75 mg at week 0 (arm 4), or placebo (arm 5). Patients completing week 24 could receive risankizumab 150 mg in a 52-week open-label extension study. Efficacy assessments included American College of Rheumatology (ACR) responses, Psoriasis Area Severity Index (PASI) responses, minimal disease activity (MDA), and 28-joint Disease Activity Score based on C-reactive protein (DAS28[CRP]). Results Of 185 randomized patients, 173 (93.5%) completed week 16 and 145 (78.4%) entered the open-label extension. Significantly more patients in each risankizumab arm achieved ACR20 at week 16 versus placebo (primary endpoint: pooled arms 1 + 2 [59.5%] versus placebo [35.7%]; treatment difference [90% CI] 24.0 [9.3, 38.7]; P = 0.007). Similarly, significantly more patients in most risankizumab arms achieved ACR20/50/70, PASI75/90/100, MDA, and greater improvements in DAS28(CRP) versus placebo at week 16. These benefits of risankizumab were maintained long term. Treatment-emergent adverse events were comparable across treatment arms. Risankizumab 150 mg was well tolerated over 76 weeks. Conclusions Risankizumab improved joint and skin symptoms versus placebo in patients with active PsA over 16 weeks; improvements were sustained long term. Risankizumab was well tolerated over the long term with no new safety findings.

Automated summary

This study assessed the efficacy and safety of risankizumab in psoriatic arthritis (PsA) patients over 76 weeks. The results showed that risankizumab significantly improved joint and skin symptoms in PsA patients compared to placebo, and these improvements were sustained long term. Risankizumab was well tolerated with no new safety findings over the 76-week period.