This Phase III, multicenter, double-blind, placebo-controlled study will evaluate the efficacy and safety of induction therapy with Afimkibart (RO7790121) compared with placebo in participants with moderately to severely active ulcerative colitis (UC).
Confirmed diagnosis of UC
Moderately to severely active UC assessed by mMS
Bodyweight >= 40 kilogram (kg)
Up to date with colorectal cancer (CRC) screening performed according to local standards
Currently known complications of UC (e.g. fulminant colitis, toxic megacolon)
Current diagnosis of Crohn's disease (CD) or indeterminate colitis, microscopic colitis, ischemic colitis, infectious colitis, radiation colitis
Presence of an ostomy or ileoanal pouch
Current diagnosis or suspicion of primary sclerosing cholangitis
Parallel
Afimkibart
DrugParticipants will receive afimkibart IV followed by afimkibart subcutaneous SC injection.
Placebo
DrugPlacebo matching IV afimkibart. Placebo matching SC afimkibart.
Percentage of Participants with Clinical Remission
Percentage of participants achieving Modified Mayo Score (mMS) \<=2 with stool frequency subscore (SFS) = 0 or 1 (up to 1-2 stools more than normal), rectal bleeding subscore (RBS) = 0 (no blood seen) and endoscopic subscore (ES) = 0 or 1 (normal appearance of mucosa or mild disease) at Week 12. mMS is a composite score of ulcerative colitis disease activity, given by the sum of three subscores: SFS, RBS and ES. Each subscore is measured on a scale from 0 to 3, with higher values associated with greater severity.
Change in Partial Modified Mayo Score (pmMS)
Change in pmMS from baseline to Week 2. pmMS is a composite score of ulcerative colitis signs and symptoms activity given by the sum of the SFS and RBS. SFS is measured on a scale from 0 (normal number of stools) to 3 (5 or more stools than normal). RBS is measured on a scale from 0 (no blood seen) to 3 (blood alone passed).
Percentage of Participants with Endoscopic Improvement
Percentage of participants achieving endoscopic subscore of 0 or 1 (normal appearance of mucosa or mild disease) at Week 12.
Percentage of Participants with Endoscopic Remission
Percentage of participants achieving endoscopic subscore of 0 (normal appearance of mucosa) at Week 12.
Percentage of Participants with Clinical Response
Percentage of participants achieving a decrease in mMS of at least 2 points and 30% from baseline and either a decrease in RBS \>= 1 or RBS = 0 or 1 (no blood seen or stool with streaks of blood) at Week 12. mMS is a composite score of ulcerative colitis disease activity, given by the sum of three subscores: SFS, RBS and ES. SFS is measured on a scale from 0 (normal number of stools) to 3 (5 or more stools than normal). RBS is measured on a scale from 0 (no blood seen) to 3 (blood alone passed). ES is measured on a scale from 0 (normal appearance of mucosa) to 3 (severe disease).
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