Janssen Research & Development, LLC
The purpose of this protocol is to evaluate the efficacy (how well it works), safety and tolerability of oral icotrokinra as therapy in adult and adolescent participants with moderately to severely active ulcerative colitis (UC, a chronic disease of the large intestine in which the lining of the colon becomes inflamed and develops tiny open ulcers).
Inclusion Criteria: * Diagnosis of ulcerative colitis (UC) established at least 12 weeks before screening including both endoscopic evidence and a histopathology report consistent with a diagnosis of UC * Moderately to severely active UC, defined as a baseline (Week I-0) modified Mayo score of 5 to 9, inclusive, using the endoscopy subscore obtained during the central review of the screening video endoscopy * An endoscopy subscore greater than or equal to (\>=) 2 as obtained during central review of the screening video endoscopy * Adolescent Participants: body weight must be \>= 40 kilograms…
Icotrokinra tablet will be administered orally.
Placebo tablet will be administered orally.