P275 Association of the improvement of synovitis and enthesitis with quality of life/patient reported outcomes in patients with psoriatic arthritis treated with ixekizumab
Authors: McGonagle Dennis , Kristensen Lars-Erik , Rudwaleit Martin , Kameda Hideto , Holzkaemper Thorsten , El Baou Céline , Smolen Josef 
Published: April 2022

Abstract

Background/Aims
Psoriatic arthritis (PsA) is an inflammatory rheumatic disease with manifestations including synovitis and enthesitis. During extensive study programs, IXE has shown a treatment effect across domains affected by PsA. Ixekizumab (IXE) is an IL17A inhibitor approved for the treatment of active PsA and axial SpA. We sought to determine whether there is any association between the improvement of synovitis with that of enthesitis from baseline (BL) through week (wk) 52 in patients (pts) with PsA treated with IXE. Additionally, the association between the improvement of synovitis and enthesitis on health-related quality of life and patient-reported outcomes was investigated.

Methods
Data from SPIRIT-P1 (NCT01695239), SPIRIT-P2 (NCT02349295) and SPIRIT-H2H (NCT03151551) were analysed. These were randomized, phase 3 trials involving pts with active PsA either biologic DMARD-naïve (P1, H2H) or TNF-inhibitor-experienced (P2). We examined the patient population randomised to IXE-treatment (80 mg of ixekizumab every 4 weeks [IXEQ4W]), that had both synovitis and enthesitis at BL. For each study, a standardisation procedure was applied to each study data in order to overcome the differences in score range between LEI and SJC. The Pearson correlation coefficient between improvement from BL in enthesitis and synovitis was calculated at each time point. The mean improvement in the SF-36 Physical Component Summary score [PCS], the Patient’s Global Assessment of Disease Activity [Pt GA], and the EuroQOL five dimensions [EQ5D]-visual analogue [VAS] score) was calculated over time for pts who reached or did not reach resolution of both enthesitis and synovitis at wk 52. Missing data were imputed with modified Baseline Carried Out Forward (mBOCF) for continuous outcomes. Non-responder imputation was used for pts with missing resolution of enthesitis or synovitis.

Results
At BL, 68 (63% of patients treated with IXEQ4W in the ITT population), 68 (56%) and 159 (56%) pts from P1, P2 and H2H respectively, had both synovitis and enthesitis. In all 3 trials, the standardized mean change from baseline in synovitis and enthesitis showed a similar pattern over time. When statistically significant, Pearson correlation coefficient values ranged from 0.16 to 0.40, indicating a positive association between mean improvement in synovitis and enthesitis. We observed an improvement of SF-36 over the 52 wks regardless of the resolution of synovitis or enthesitis. The most pronounced improvement was shown by pts achieving resolution of both synovitis and enthesitis, followed by the pts achieving one or the other.

Conclusion
Across the SPIRIT trials, treatment with IXE led to the significant improvement in synovitis and enthesitis with a positive association between the improvement of both. Furthermore, pts that resolved both measures at wk 52 experienced an earlier and greater improvement in the SF-36 Physical Component Scale.

Disclosure
D. McGonagle: Corporate appointments; D. McGonagle has undertaken research and/or educational program activity with: AbbVie, Celgene, Johnson & Johnson, Merck Sharp & Dohme, Pfizer, and UCB Pharma. L. Kristensen: Consultancies; AbbVie, Amgen, Bristol Myers Squibb, Celgene, Eli Lilly and Company, Janssen, Merck Sharp & Dohme, Novartis, Pfizer, and UCB Pharma. Member of speakers’ bureau; AbbVie, Amgen, Biogen, Bristol Myers Squibb, Celgene, Eli Lilly and Company, Janssen, Merck Sharp & Dohme, Novartis, Pfizer, and UCB Pharma. Grants/research support; Biogen, Janssen Cilag, and UCB Pharma. M. Rudwaleit: Consultancies; AbbVie, Bristol Myers Squibb, Celgene, Chugai Pharmaceutical/Roche, Eli Lilly and Company, Janssen, Merck Sharp & Dohme, Novartis, Pfizer, and UCB Pharma. H. Kameda: Consultancies; AbbVie, Asahi Kasei Pharma, Astellas, Bristol Myers Squibb, Chugai Pharmaceutical, Eisai, Eli Lilly and Company, Janssen, Mitsubishi Tanabe Pharma, Novartis, Sanofi, and Takeda. Member of speakers’ bureau; AbbVie, Asahi Kasei Pharma, Astellas, Bristol Myers Squibb, Chugai Pharmaceutical, Eisai, Eli Lilly and Company, Janssen, Mitsubishi Tanabe Pharma, Novartis, Sanofi, and Takeda. T. Holzkaemper: Shareholder/stock ownership; Eli Lilly and Company. C. El Baou: Other; C. El Baou is an independent contractor working for: Eli Lilly and Company. J. Smolen: Consultancies; AbbVie, Amgen, AstraZeneca, Astro Pharma, Bristol Myers Squibb, Celgene, Celltrion, Chugai Pharmaceutical, Eli Lilly and Company. Grants/research support; Gilead Sciences, GlaxoSmithKline, ILTOO Pharma, Janssen, MedImmune, Merck Sharp & Dohme, Novartis-Sandoz, Pfizer, Roche, Samsung, Sanofi, and UCB Pharma.