A Study to Evaluate IBI112 in the Treatment of Moderate to Severe Active Ulcerative Colitis

A Multicenter, Randomized, Double-blind, Parallel, Placebo-controlled Phase II Clinical Study to Evaluate the Efficacy and Safety of IBI112 in Patients With Moderate to Severe Active Ulcerative Colitis

To evaluate the efficacy of IBI112 induction therapy in patients with moderate and severe active Ulcerative Colitis (UC) to achieve clinical remission.

This is a phase 2 randomized,double-blind, placebo-controlled study to evaluate the efficacy and safety of IBI112 induction and maintenance therapy in subjects with moderate to severe active ulcerative colitis

Inclusion Criteria:

1. Diagnosis of ulcerative colitis at least 3 months ago, including endoscopy evidence supporting UC and histopathological evidence supporting UC diagnosis;
2. Patients with moderate to severe ulcerative colitis, defined as modified Mayo Score ≥4 and endoscopic score ≥2;
3. Subject must have received at least one prior treatment or first use of a biological agent:

Exclusion Criteria:

1. Diagnosis of ischemic colitis, infectious colitis, radiation colitis, microscopic colitis, uncertain colitis, etc., or crohn's disease;
2. UC lesions were limited to rectum or involved colon < 15cm;
3. Evidence of toxic hirschsprung's disease was found during screening;
4. History or evidence of atypical hyperplasia of the colon, adenomatous polyps (not removed before entering the study) or gastrointestinal tumors;