LY4268989 (MORF-057) Co-Administered With Mirikizumab in Adults With Moderately to Severely Active Ulcerative Colitis:

Inclusion Criteria: * Have had an established diagnosis of UC of ≥3 months in before baseline, which includes endoscopic evidence of UC and a histopathology report that supports a diagnosis of UC * Have moderately to severely active UC as defined by a mMS of 5 to 9 with an ES ≥2 confirmed by central reader at screening endoscopy and RB ≥1. * Participants with greater than 8 years of UC symptoms have documented evidence of having had a surveillance colonoscopy within 1 year, or according to local country or regional medical guidelines, to evaluate for polyps, dysplasia, or malignancy, prior to randomization * Are up-to-date on colorectal cancer surveillance per local society guidelines * Have an inadequate response to, loss of response to, or intolerance to at least 1 of the medications: * Conventional-failed participants: Participants who have had an inadequate response to or a loss of response to or are intolerant to at least 1 of the following medications: corticosteroids or immunomodulators (Does not apply to US) NOTE: After the interim analysis, participants with inadequate response, loss of response, or intolerance to conventional UC therapy without prior exposure to biologics may be enrolled if deemed appropriate (Applies to the US) * Advanced therapy-failed participants: Participants who have an inadequate response to or a loss of response to, or are intolerant to advanced therapy for UC, defined as: * a biologic or biosimilar medication such as anti-tumor necros…