AbbVie (NYSE: ABBV) recently shared positive top-line results from its phase 3 clinical trial of Skyrizi that treated patients with moderately to severely active ulcerative colitis (UC). Let's examine the data from the clinical trial and the U.S. UC market to resolve this question. Ulcerative colitis is a form of inflammatory bowel disease (IBD) that causes damage to the gastrointestinal (GI) tract.