Publication date: Jan 11, 2025

Bimekizumab, a monoclonal IgG1 antibody that selectively inhibits interleukin (IL)-17F in addition to IL-17A, previously demonstrated efficacy and was well tolerated to 1 year in patients with non-radiographic (nr-) and radiographic (r-) axial spondyloarthritis (axSpA). Here, we report bimekizumab safety and efficacy to 2 years. Patients completing week 52 in the phase 3 studies BE MOBILE 1 (nr-axSpA; NCT03928704) and 2 (r-axSpA; NCT03928743) were eligible for an ongoing open-label extension (OLE; NCT04436640). All OLE patients received subcutaneous bimekizumab 160 mg every 4 weeks. Safety outcomes for patients who received ≥1 bimekizumab dose, and efficacy outcomes for all randomised patients, are reported to week 104. In the OLE (Weeks 52 - 104), 70. 8% (367/518) of patients reported ≥1 treatment-emergent adverse event (TEAE). Most frequent TEAEs (EAIR/100PY) were SARS-CoV-2 (COVID-19) infection (25. 2), nasopharyngitis (11. 0) and oral candidiasis (5. 4). Fungal infection EAIR/100PY was 11. 8 (majority Candida infections: 6. 8; most mild/moderate, none serious/systemic). Inflammatory bowel disease and uveitis rates were low; no major adverse cardiovascular events or deaths occurred. TEAE incidence rate was generally similar across Weeks 0-52 and 52-104. At week 104, >50% of randomised patients (N = 586) achieved ASAS40; ∼60% achieved ASDAS low disease activity (30% achieved ASDAS inactive disease (57% of patients achieving MRI remission. The safety profile of bimekizumab remained consistent with prior reports, with no new safety signals identified. 1-year efficacy was sustained to 2 years across patients with nr-axSpA and r-axSpA.

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