The main objective of this study is to evaluate the efficacy of upadacitinib in combination with a corticosteroid taper regimen compared to placebo in combination with a corticosteroid taper regimen.

Inclusion Criteria:

• Participants must be at least 18 years of age (at least 15 years of age in Japan)
• Clinical diagnosis of TAK and fulfilling the Japanese Guidelines for Management of Vasculitis Syndrome 2017 criteria.
• Participant must have experienced a relapse of TAK within 12 weeks of Baseline despite being on treatment with oral corticosteroid.
• Participants must be in remission and on a stable corticosteroid dose prior to Baseline.

Exclusion Criteria:

• Treatment with an interleukin-6 (IL-6) inhibitor or Janus Kinase (JAK) inhibitor (including but not limited to tocilizumab, sirukumab, sarilumab, upadacitinib, tofacitinib, baricitinib, ruxolitinib, peficitinib, and filgotinib) within 4 weeks of Baseline.
• Current use of immunomodulators other than corticosteroids.

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