A Study Evaluating the Safety and Efficacy of Upadacitinib in Adults With Active Ankylosing Spondylitis

Exclusion Criteria

• •Prior exposure to any Janus kinase (JAK) inhibitor (including but not limited to tofacitinib, baricitinib, and filgotinib).
• •Prior exposure to any biologic therapy with a potential therapeutic impact on spondyloarthritis (SpA).
• •Intra-articular joint injections, spinal/paraspinal injection(s), or parenteral administration of corticosteroids within 28 days prior to the Baseline visit. Inhaled or topical corticosteroids are allowed.
• •Participant on any other DMARDs (other than those allowed), thalidomide or apremilast within 28 days or five half-lives (whichever is longer) of the drug prior to the Baseline visit.
• •Participant on opioid analgesics (except for combination acetaminophen/codeine or acetaminophen/hydrocodone which are allowed) or use of inhaled marijuana within 14 days prior to the Baseline visit.
• •Participant has a history of inflammatory arthritis of different etiology other than axial SpA (including but not limited to rheumatoid arthritis, psoriatic arthritis, mixed connective tissue disease, systemic lupus erythematosus, reactive arthritis, scleroderma, polymyositis, dermatomyositis, fibromyalgia), or any arthritis with onset prior to 17 years of age.
• •Laboratory values meeting the following criteria within the Screening period prior to the first dose of study drug: serum aspartate transaminase \> 2 × upper limit of normal (ULN); serum alanine transaminase \> 2 × ULN; estimated glomerular filtration rate by simplified 4-variable Modification of Diet in Renal Disease formula \< 40 milliliter (mL)/minute/1.73m\^2; hemoglobin \< 10 gram/deciliter, total white blood cell count \< 2,500/microliter (μL); absolute neutrophil count \< 1,500/μL; absolute lymphocyte count \< 800/μL; and platelet count \< 100,000/μL.