Long-Term Efficacy and Safety of Risankizumab for Active Psoriatic Arthritis: 196-Week Results From the KEEPsAKE 2 Trial

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Andrew Östör
Filip Van den Bosch
Kim Papp
Cecilia Asnal
Ricardo Blanco
Jacob Aelion
Ana Biljan
Jonathon Rocco
Fang Liu
Ahmed Soliman
Doug Ashley
Lila Glotfelty
Alan Kivitz

Keywords

Psoriatic arthritis, risankizumab, KEEPsAKE 2, csDMARD-IR, Bio-IR

Abstract

Introduction & Objectives: Here, we report the long-term efficacy and safety of risankizumab (RZB) in patients with active psoriatic arthritis (PsA) through week 196 of the KEEPsAKE 2 trial. 


Materials & Methods: Adult patients with previous inadequate response or intolerance to 1 or 2 biological therapies (Bio-IR) and/or ≥1 conventional synthetic disease-modifying antirheumatic drug (csDMARD-IR) were randomized in a 1:1 ratio to subcutaneous RZB 150mg or matched placebo for a 24-week double-blind placebo controlled period. Starting at week 28, patients received open-label RZB every 12 weeks thereafter. Efficacy and safety analyses were conducted in all randomized patients who received ≥1 dose of the study drug. Statistical approaches included non-responder imputation incorporating multiple imputation (NRI-MI) for binary endpoints, and mixed-effect model for repeated measures (MMRM) for categorical endpoints at week 196. Safety assessments based on treatment emergent adverse events (TEAEs) are summarized using exposure-adjusted event rates (EAERs, events/100 patient-years [E/100PYs]).


Results: 51.3% of patients on RZB 150mg (N=224) achieved the primary endpoint of ACR20 at week 24 compared to 26.5% on placebo (N=219). Patients on open-label RZB maintained similar efficacy results at week 196 as those reported previously at weeks 24, 52, 100, and 148. At week 196, 54.5% patients receiving continuous RZB and 50.2% patients on PBO/RZB achieved ACR20; 35.3% on RZB and 37.0% on PBO/RZB achieved ACR50; 35.3% on RZB and 37.4% on PBO/RZB achieved minimal disease activity (MDA). In patients with psoriasis severity of ≥ 3% of body surface area (BSA) at baseline, 66.7% on RZB and 56.3% on PBO/RZB achieved PASI90 at week 196. In patients with enthesitis at baseline, 49.0% on RZB and 50.0% on PBO/RZB achieved resolution. In patients with dactylitis at baseline, 75.0% on RZB and 59.6% on PBO/RZB achieved resolution. Among patients with HAQ-DI scores of at least 0.35 at baseline, 36.7% on RZB and 40.6% on PBO/RZB achieved improvements of at least 0.35 at week 196. The overall rates of TEAEs (170.7 E/100PYs), serious TEAEs (9.8 E/100PYs) and AEs leading to discontinuation of study drug (1.4 E/100PYs) remained stable and consistent with rates reported previously at week 24 for the placebo-controlled period, and weeks 52, 100, and 148.


Conclusion: The 196-week results from KEEPsAKE 2 demonstrate that long-term treatment with RZB shows durable efficacy in Bio-IR and/or csDMARD-IR patients with PsA, with no new safety findings.

References

1. Östör A, et. al. Ann Rheum Dis. 2022;81:351-8.

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