Bimekizumab showed sustained 1-year efficacy in axSpA across age, BMI, CRP, and HLA-B27 subgroups. ASAS40, ASDAS, BASDAI, ASQoL, and MRI scores improved in most groups—especially age ≤35, BMI 25–30, CRP >5, and HLA-B27+. Abstract 1451 @RheumNow #ACR25