This study consists of a screening period followed by a placebo-controlled Part 1 phase and then a placebo-controlled Part 2 phase. An open label Part 3 phase is open to subjects who: complete the Part 2, are considered non-responders following the Part 1, or have disease worsening during Part 2.
This is a randomized, double-blind, placebo-controlled, multicenter Phase 3 study that will enroll approximately 368 subjects aged 18 to 75 years old with Moderately to Severely Active Ulcerative Colitis.