AbbVie, a global biopharmaceutical company, announced the start of a large Phase 3 clinical trial program to study the use of ABT-494, an investigational, once-daily, oral selective JAK1 inhibitor for the treatment of rheumatoid arthritis (RA). This program will include adult patients with inadequate responses (IR) to conventional or biologic disease-modifying antirheumatic drugs (DMARDs), as well as methotrexate-naive patients.