Abstract
INTRODUCTION: There are limited data on the use of advanced therapies to treat psoriatic arthritis (PsA) in Russia. Guselkumab, an interleukin (IL)-23p19-subunit inhibitor, demonstrated efficacy in patients with PsA in the phase 3 DISCOVER-1 and -2, and COSMOS trials. This analysis evaluated the efficacy and safety of guselkumab in patients with PsA in Russia. METHODS: This post hoc analysis of DISCOVER-1 and -2 included 1002 biologic-naïve patients with active PsA from Russia (n = 317) and the rest of the world (RoW; n = 685). Patients received guselkumab 100 mg every 4 weeks (Q4W), or at week 0 and 4 then Q8W, or placebo then guselkumab Q4W at week 24 (Russian: n = 119, 88, and 110, respectively; RoW: n = 216, 246, and 223, respectively). Outcomes through week 52 were pooled (DISCOVER-1 and -2); outcomes from week 52 to 100 represent DISCOVER-2 only. RESULTS: In patients from Russia, ≥ 20% improvement in the American College of Rheumatology (ACR20) criteria response rates were higher with guselkumab vs. placebo at week 24, increased through week 52, and were consistent across all guselkumab-treated groups at week 100. Similar trends were generally observed for ACR50, ≥ 90% improvement in Psoriasis Area and Severity Index (PASI90), achievement of Disease Activity in Psoriatic Arthritis (DAPSA) low disease activity/remission and minimal disease activity, enthesitis and dactylitis resolution, ≥ 0.35 improvement in Health Assessment Questionnaire-Disability Index (HAQ-DI) score, improvement in patient-reported pain, and measures in patients with axial PsA (including Bath Ankylosing Spondylitis Disease Activity Index [BASDAI], Ankylosing Spondylitis Disease Activity Score [ASDAS], and patient-reported spinal pain). Efficacy responses were similar between patients from Russia and the RoW across all endpoints and timepoints. The safety profile of guselkumab in patients from Russia was consistent with previous findings. CONCLUSION: This analysis demonstrated that the safety and efficacy profiles of guselkumab across all PsA domains and patient-reported outcomes in patients from Russia were similar to those in patients from the RoW. TRIAL REGISTRATION NUMBERS: NCT03162796 and NCT03158285.