One-year retention rate of ixekizumab in patients with psoriatic arthritis and axial spondyloarthritis: Real-world data from the BIOBADASER registry

Abstract

Introduction

Ixekizumab (IXE) is a selective interleukin 17A (IL-17A) monoclonal antibody approved for the treatment of psoriatic arthritis (PsA) and axial spondyloarthritis (axSpA). Limited real-world data are available on its retention rate and effectiveness. The objective of this study was to assess the one-year retention rate of IXE in a real-world cohort of patients with axSpA and PsA and to identify potential predictive factors for drug retention.

Method

Prospective and observational study derived from BIOBADASER 3.0, a multicenter registry of advanced therapies including patients who have ever received IXE for PsA or axSpA. The one-year retention rate of the treatment in both diseases was evaluated using Kaplan–Meier curves and multivariable Cox regressions.

Results

A total of 335 patients ever exposed to IXE were included (PsA = 250; axSpA = 85). IXE was used as first-line treatment only in 5.3% of patients, and after TNFi in 94.7% of patients. In axSpA and PsA, drug survival at 12 months was 69.5% (95% CI 64.0–74.3), slightly higher in PsA (71.3% (95% CI 65.0–75.6)) versus axSpA (63.8% (95% CI 51.5–73.7)). The multivariable Cox regression models showed that female sex and longer disease duration were factors associated with IXE withdrawal in the whole population, while concomitant use of methotrexate reduced the risk of discontinuation.

Conclusions

In this real-world study, IXE showed an acceptable retention rate in patients with PsA and axSpA after one year of follow-up. Female sex and longer disease duration were associated with risk of withdrawal.