A Study to Evaluate Efficacy and Safety of MK-8690 in Participants With Moderately to Severely Active Ulcerative Colitis (MK-8690-002)

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• The main inclusion criteria include but are not limited to the following:
• Has had ulcerative colitis (UC) (from onset of symptoms) for at least 3 months before Randomization
• Has moderately to severely active UC
• Has a weight ≥40 kg
• Satisfies at least 1 of the criteria: Has had an inadequate response or loss of response to 1 or more protocol-specified treatments; protocol specified corticosteroid dependence; has been intolerant to 1 or more protocol-specified UC treatments
• Is on treatment with any protocol-specified drugs during the study and meets drug stabilization requirements, as applicable
  • The main exclusion criteria include but are not limited to the following:
• Has a diagnosis of Crohn's Disease (CD) or indeterminate colitis (inflammatory bowel disease (IBD)-undefined) or other types of colitis or enteritis that may confound efficacy assessment
• Has a current diagnosis of fulminant colitis and/or toxic megacolon
• Has UC limited to the rectum
• Has a current or impending need for colostomy or ileostomy
• Has had a total proctocolectomy or partial colectomy
• Has UC exacerbation requiring hospitalization within 2 weeks before Screening
• Has any active infection as specified in the protocol
• Is known to be infected with hepatitis B virus (HBV), hepatitis C virus (HCV), or human immunodeficiency virus (HIV)
• Has evidence of active tuberculosis (TB) or meets TB exclusionary parameters
• Has a history of cancer (except fully treated nonmelanoma skin cell cancers or cervical carcinoma in situ after complete surgical removal) and is disease free for <5 years before Randomization or has a history of colorectal cancer at any time
• Has prior or current evidence of definite colonic dysplasia except for low-grade dysplasia that has been completely removed
• Has had major surgery within 3 months before Screening or has a major surgery (ie, surgical procedure requiring general anesthesia) planned during the study
• Has received protocol-specified prohibited medications