Juvenile psoriatic arthritis is a complex, chronic, progressive, debilitating musculoskeletal disease with significant remaining medical need. There is a need for medications which have a similar efficacy profile and a similar safety profile relative to currently available treatment for jPsA which include anti-tumor necrosis factor alpha (TNF alpha) inhibitors (though mostly off-label) and secukinumab. STELARA (ustekinumab) is a fully human immunoglobulin G (IgG) 1 kappa monoclonal antibody (mAb) which binds with high affinity to the p40 subunit common to both interleukin (IL)-12 and IL 23 preventing IL-12/23p40 binding to the IL 12 Rb1 cell surface receptor shared by both cytokines. Through this mechanism of action, ustekinumab effectively neutralizes IL-12 T helper 1- and IL-23 T helper 17-mediated cellular responses. TREMFYA (guselkumab) is a fully human IgG1 lambda (G1 lambda) mAb that binds to the p19 subunit of human IL-23 with high affinity. The binding of guselkumab to IL-23 blocks the binding of extracellular IL-23 to the cell surface IL-23 receptor, inhibiting IL-23-specific intracellular signaling and subsequent activation and cytokine production. This study consists of Screening period (up to 6 weeks), Treatment period (up to 52 weeks) and a final safety visit at Week 68. The total duration of the study is up to 68 weeks.
The purpose of this study is to evaluate the pharmacokinetics (PK) and efficacy of ustekinumab and guselkumab in juvenile psoriatic arthritis (jPsA).