A Study of Secukinumab to Evaluate Maintenance of Response in Participants With Non-radiographic Axial Spondyloarthritis Who Achieved Remission

This study will establish whether prolonged chronic dosing with secukinumab is needed in participants with nr-axSpA who have achieved remission. Remission is defined as Ankylosing Spondylitis Disease Activity Score - C-reactive protein (ASDAS-CRP) Inactive Disease (ID) response Inactive Disease (ID) response (ASDAS-CRP < 1.3). The maintenance of remission on continued secukinumab treatment will be evaluated compared to placebo using a randomized withdrawal design. The primary outcome measure for this study is the proportion of participants remaining flare-free at Week 120. Study treatment will be as follows: - Open-label Secukinumab PFS (prefilled syringe) will be labeled as AIN457 150mg/1mL - Double-blind Secukinumab and Placebo PFS will be labeled as AIN457 150mg/1mL/Placebo. Study duration will be up to 128 weeks from Baseline. The treatment duration will be up to 120 weeks with last treatment administration at Week 116. In the Treatment Period 1 participant will attend a site visit approximately 1 month after Baseline and approximately every 12 weeks thereafter. In the Treatment Period 2 participant will attend site visits approximately every 4 weeks.