Conditions: Ulcerative Colitis Inflammatory Bowel Disease
Keywords: Rosiglitazone Ulcerative Colitis
Allocation: RANDOMIZED | Intervention model: PARALLEL
Enrollment: 105
Healthy volunteers: yes

Brief summary:
This is a multicenter, randomized, double-blind, placebo-controlled study evaluating rosiglitazone: 4 mg tablets or placebo tablets administered orally twice daily for 12 weeks. The purpose of the study is to evaluate the efficacy and safety of rosiglitazone in the treatment of mild to moderately active ulcerative colitis. Disease activity will be measured using a standard disease activity index. Calculation of the index requires patients to undergo flexible sigmoidoscopy at the start of the study and at week 12.

Detailed description:
Ulcerative colitis is a disease characterized by inflammation (the changes that happen when tissues in the body are injured) of all or a portion of the large intestine. There is presently no medical cure for ulcerative colitis, although surgical removal of the colon would cure the disease. Ulcerative colitis is generally treated with medications against diarrhea and infection, medications which suppress the immune system (the body system that protects a person against foreign substances) or with surgery.

It is thought that the chronic inflammation associated with ulcerative colitis may be related to the release of certain chemicals produced by the body. Rosiglitazone has been shown to inhibit the production of some of these chemicals. The active component of rosiglitazone has also been shown to improve colitis in animal models of colitis. The purpose of this study is to evaluate the benefit of the drug for ulcerative colitis by comparing it to placebo.

This is a randomized controlled trial of rosiglitazone versus placebo in patients who have failed to respond to 5-ASA therapy. Participants will be randomized to receive either rosiglitazone 4mg bid or placebo bid twice daily for a total of 12 weeks. Disease activity will be measured using the Disease Activity Index (DAI) at visits 3 through 8. Additional outcomes measured will include histological disease activity (visits 3 and 7) and quality of life using the IBDQ (visits 3 through 8). The principle analyses will be an intent-to-treat analysis to examine the efficacy of rosiglitazone at a dose of 4mg twice daily compared to placebo to achieve a partial or complete response. Additionally, the change in NF-κB activation prior to and following therapy with either placebo or rosiglitazone will be examined using immunohistochemistry techniques.

Arms:
arm 1: 4 mg of rosiglitazone taken twice daily for 12 weeks. arm 2: Identical in appearance to study drug taken twice daily for 12 weeks.

Interventions: intervention 1: Rosiglitazone intervention 2: Placebo
Intervention descriptions: intervention 1: 4mg orally twice daily for 12 weeks intervention 2: pill that looks identical to rosiglitazone

Protocol document: