Study to Evaluate the Safety and Efficacy of Two Drug Regimens in Subjects With Moderate to Severe Ulcerative Colitis

Inclusion Criteria:

- Diagnosis of Ulcerative Colitis (UC) for at least 90 days, confirmed by endoscopy
during Screening period.

- Active UC with Mayo Score of 6 to 12 points and endoscopy subscore of 2 to 3 despite
concurrent or prior treatment with a full and adequate course, in the opinion of the
Investigator, with oral corticosteroids or immunosuppressants or both.

Exclusion Criteria:

- Subject with Crohn's disease (CD) or indeterminate colitis (IC).

- Current diagnosis of fulminant colitis and/or toxic megacolon.

- Subjects with disease limited to the rectum (ulcerative proctitis) during the
screening endoscopy.

- Chronic recurring infections or active Tuberculosis (TB).