Effectiveness of anti-interleukin-23 therapy in psoriatic arthritis: A pilot prospective real-world study

Aim: This study aimed to show the effectiveness of interleukin (IL)- 23 inhibitors in psoriatic arthritis (PsA) at weeks 12 and 24 in a real- world setting.Materials and Methods: Forty- three patients with active PsA were enrolled in this study. These patients were treated with either guselkumab (n =20) or risankizumab (n = 23). Treatment responses at the 12th and 24th weeks were evaluated with the parameters of the number of joints with active arthritis, Psoriasis Area Severity Index (PASI) response rate, Bath Ankylosing Spondylitis Disease Activity Index (BASDAI) score, Disease Activity Index for Psoriatic Arthritis (DAPSA) score, and C-reactive protein (CRP) value. The study's primary endpoint was BASDAI <= 4 and DAPSA <= 14 at week 24, and the secondary endpoint was the absence of joints with clinically active arthritis signs at week 24.Results: IL- 23 inhibition significantly improved all treatment response parameters at the 12th and 24th weeks (P < 0.001). While 90% of patients reached the primary end- point with anti- IL23 therapy, 74% achieved the secondary endpoint. Both biologic-naive and biologic-experienced patients responded significantly to anti- IL- 23 therapy. Also, no adverse events related to anti- IL- 23 agents were observed.Conclusions: The response parameters indicating the severity of PsA (the number of joints with active arthritis, BASDAI score, DAPSA score, and CRP value) and a parameter indicating the severity of skin involvement, that is, PASI score, significantly improved with anti- IL- 23 therapy at weeks 12 and 24. Moreover, significant improve- ment was achieved at week 24 compared to week 12 in all response parameters.