Prevalence and predictors of tumour necrosis factor inhibitor persistence in psoriatic arthritis.

Objectives: To evaluate TNF-α inhibitor (TNFi) persistence when used as first- or second-line biologic therapy for the management of PsA, and to determine baseline clinical and laboratory parameters associated with TNFi persistence.

Methods: A retrospective single-centre cohort study was performed on all patients with PsA initiated on TNFi therapy between 2003 and 2015. Demographic, clinical and laboratory characteristics were compared with TNFi persistence, using Kaplan-Meier survival and Cox proportional hazards models.