A Phase 3b/4 Randomized, Double-Blind, Double Dummy, Active Comparator-Controlled Study, Comparing the Efficacy and Safety of Upadacitinib Versus Adalimumab in Subjects With Moderate to Severe Rheumatoid Arthritis on a Stable Background of MTX and Who Had an Inadequate Response or Intolerance to a Single TNF Inhibitor (SELECT- SWITCH)

Rheumatoid Arthritis (RA) is a chronic inflammatory disease causing pain, stiffness, swelling and loss of joint function. This study will assess how safe and effective upadacitinib is in treating RA when compared to adalimumab in adult participants with inadequate response or intolerance to one TNF-inhibitor who are on a stable dose of methotrexate (MTX). Adverse events and change in disease activity will be assessed. Upadacitinib is an approved drug for the treatment of RA. This study is double-blinded means that neither the participants nor the study doctors will know who will be given upadacitinib and who will be given adalimumab. Study doctors put the participants in 1 of the 2 groups, called treatment arms randomly, to receive either upadacitinib or adalimumab. There is 1 in 2 chance that participants will receive adalimumab. Each group consists of 2 periods. Approximately 480 participants diagnosed with RA will be enrolled in approximately 250 sites across the world. Participants will receive the oral upadacitinib once daily and matching adalimumab placebo every other week, or the subcutaneous adalimumab every other week and matching upadacitinib placebo once daily during Period 1. Eligible participants will continue to receive same study treatment in Period 2 as assigned in Period 1 and will be followed for 30 days and 70 days. There may be higher treatment burden for participants in this trial compared to their standard of care. Participants will attend regular visits during the study at a hospital or clinic. The effect of the treatment will be checked by medical assessments, checking for side effects and completing questionnaires.