A Phase 1 Study Comparing Bimekizumab Given Intravenously or by Injection in Adults with Active Psoriatic Arthritis or Axial Spondyloarthritis

What this Trial Is About

Researchers are evaluating bimekizumab administered intravenously compared to subcutaneous injection in adults with active psoriatic arthritis or active axial spondyloarthritis. The study aims to show that the intravenous method is not less effective than the subcutaneous method by assessing how the drug moves in the body over time. This is a Phase 1, open-label, randomized, parallel-group study focused on treatment. Participants will receive one of three dosing regimens of bimekizumab during a pharmacokinetics lead-in phase and continue with the same assigned regimen during the treatment period. The dosing regimens include intravenous and subcutaneous administration of bimekizumab at specified times. Subjects are randomized into one of two experimental arms reflecting different intravenous regimens or a third arm receiving the subcutaneous regimen. During the study, participants will be monitored for steady-state trough concentration of the drug at week 16. Safety is assessed by tracking treatment-emergent adverse events, serious adverse events, and any events leading to withdrawal from the study through week 29. The study duration extends to the end of safety follow-up, with regular assessments to evaluate drug levels and participant health under medical supervision.

A Study to Learn if Bimekizumab Given in Different Ways is Safe and Moves Similarly Throughout the Body Over Time in Adults