An Efficacy and Safety Study of Ustekinumab in Participants With Active Nonradiographic Axial Spondyloarthritis

A Phase 3, Multicenter, Randomized, Double-blind, Placebo-controlled Study Evaluating the Efficacy and Safety of Ustekinumab in the Treatment of Subjects With Active Nonradiographic Axial Spondyloarthritis

The purpose of this study is to assess the efficacy and safety of ustekinumab in adult participants with active nonradiographic axial spondyloarthritis (nr-AxSpA) measured by the reduction in signs and symptoms of nonradiographic axial spondyloarthritis (nr-AxSpA).

This is a phase 3, multicenter, randomized, double-blind, placebo-controlled study evaluating the efficacy and safety of ustekinumab in the treatment of participants with active non-radiographic axial spondylo arthritis. Participants will receive either placebo or ustekinumab 45 or 90 milligram (mg). Participants will primarily be assessed for Assessment of Spondylo Arthritis (ASAS) International Society criteria 20 at Week 24. Safety will be monitored throughout the study.

Inclusion Criteria:

• Participants must be classified as having nonradiographic axial spondyloarthritis (nr-AxSpA) based on 2009 Assessment of SpondyloArthritis International Society (ASAS) criteria
• Must have an age at nr-AxSpA onset of <= 45 years
• Must have at screening or active inflammation on magnetic resonance imaging (MRI) as evidenced by the central readers and no radiographic sacroiliitis that fulfills the 1984 modified New York Criteria
• Must have symptoms of active disease at screening and at baseline, as evidenced by both a BASDAI score of >= 4 and a visual analogue scale (VAS) score for total back pain of more than or equal to (>=) 4, each on a scale of 0 to 10

Exclusion Criteria:

• Have radiographic sacroiliitis fulfilling the 1984 modified New York Criteria
• Have other inflammatory diseases that might confound the evaluations of benefit from the ustekinumab therapy
• Have received any systemic immunosuppressives or disease-modifying anti-rheumatic drug (DMARDs) other than methotrexate (MTX), sulfasalazine (SSZ), or hydroxychloroquine (HCQ) within 4 weeks prior to first administration of study agent
• Have received epidural, intra-articular, intramuscular (IM), or intravenous (IV) corticosteroids, including adrenocorticotropic hormone during the 4 weeks prior to first administration of study agent
• Have received prior biologic therapy other than anti-TNFα
• Have received more than 1 prior anti-TNFα agent