A Study on the Safety of TAK-279 and Whether it Can Reduce Inflammation in the Bowel of Participants With Moderately to Severely Active Ulcerative Colitis

The main aim of this study is to learn if TAK-279 reduces bowel inflammation and symptoms compared to placebo. Another aim is to compare any medical problems that participants have when they take TAK-279 or placebo and how well the participants tolerate any problems.

The participants will take capsules of either TAK-279 or placebo for up to 3 months (12 weeks). Then all the participants will receive TAK-279 for the rest of the treatment part of the study (1 year or 52 weeks).

During the study, participants will visit their study clinic several times.

Study TAK-279-UC-2001 is a multicenter, randomized, placebo-controlled, study with a 12-week double-blinded induction treatment period, a 40-week open-label treatment period (52 total weeks of treatment), and a 4-week safety follow-up period.

An approximate total of eligible 207 participants will be randomized to one of the three treatment groups -

1. TAK-279 Dose 1
2. TAK-279 Dose 2
3. Placebo

The maximum study duration per participant is approximately 60 weeks, including up to 30 days for the screening period, a 12-week randomized and double-blinded induction treatment period, a 40-week open-label treatment period, and a 4-week safety follow-up period.