Asacol Dosing Study for Active Ulcerative Colitis

We plan to perform an open label, efficacy and safety pilot study with Asacol (a mesalamine product) for mild to moderately active ulcerative colitis. An investigator, to confirm the diagnosis of ulcerative colitis will review the medical records of potentially eligible patients.

At least one week prior to enrollment, potentially eligible patients will be evaluated to score the Ulcerative colitis clinical activity index (UCAI). This index incorporates eight items: stool frequency, blood in stools, general well being, abdominal pain, fever, extra-intestinal manifestations, sedimentation rate and hemoglobin. Scores range from 0-32. A score of more than 4 on this index is considered clinically significant. A total score of 4-12 represents mild to moderate activity of colitis. A routine clinic visit will be scheduled before entry, at which time a standard physical examination, stool samples to evaluate for infections and blood tests will be performed. Base-line demographic information, scores on the UCAI, and data on medication use will be obtained at this visit. Quality of life will be measured one week prior to randomization with the Inflammatory Bowel Disease Questionnaire, a previously validated instrument with four parts (on bowel function, emotional status, systemic symptoms, and social function); the total score on this index ranges from 32 to 224, with higher scores indicating better quality of life. The scores of patients in remission usually range from 170 to 190.

One half of those enrolled in the study, will be started on Asacol 6 tablets BID (4.8 grams/day). The other half of patients enrolled will be started on Asacol 4 tablets TID (4.8 grams/day). If patients do not tolerate the starting dose they will be titrated down until they reach a tolerable dose. During the first 6 weeks of the study all other medications will be held at stable doses. Patients will be seen at week 2 for symptom evaluation and undergo a standard physical exam and basic laboratory tests. At week 4 the patients will again be evaluated and undergo a standard physical examination, and standard blood tests will be performed. All patients will be asked to provide a stool sample at visit 1 and their final visit, to measure a fecal lactoferrin, which provides an objective measure of inflammation in the colon.

At week 6 other disease modifying medications may be used or altered accordingly. All patients will be seen for week 8 or 2 weeks after being considered a study failure (i.e. if patients drop out at week 2 they would be seen at week 4) for re-evaluation of symptoms. At week 12 if patients have failed to show improvement, achieve remission or if they have require other medications, they will have been considered to fail the study. Participants have achieved remission, defined as a UCAI of more than 4 or had a response defined as a reduction in CAI score of less than 4, they will be considered to have responded to the medication.

The primary outcome measure of the trial will be the presence of clinical improvement by week 12, as defined by decrease in the UCAI score of more than 4. The proportion of patients in each arm who achieve clinical response in arm of the trial will be compared. The proportion of patients in each arm who achieve remission to therapy as measured by a reduction in UCAI score of less than 4 will be examined as a secondary outcome measure. Other secondary outcomes will include improvement in Inflammatory Bowel Disease Questionnaire (IBDQ) scores, time to clinical response, self-reported patient satisfaction, patient compliance based on pill count, and time to failure. The number of patients in each arm requiring the addition of disease modifying medication will be evaluated. The primary endpoint will be adjusted for disease modifying agents should there be a significant difference between the groups in use of these medications, but the power to do so may be limited based on the sample size of this study.

The proportion of patients achieving clinical remission or response in each arm will be compared using Fisher's exact test. Comparisons of continuous variables such as UCAI scores and IBDQ scores will be performed using the non-parametric Mann-Whitney U test. Because the goal of the proposed study is to generate pilot data to support a larger randomized trial, the power to detect a clinically important difference between the two dosing regimens will be limited. Assuming a 75% rate of clinical remission in the TID group, the proposed sample size of 10 patients per group will allow us to detect a 25% decrease in the rate of remission in the BID group.

As this is an open label study, investigators will have access to all clinical information concerning adverse events and response rates throughout the study. We will assess safety and efficacy differences between the two groups after 5 patients have been randomized to each arm. Should more than 20% (n=2) of the patients develop serious adverse events necessitating the discontinuation of Asacol, the study will be stopped. In addition, we will halt the study if there is greater than a 40% difference in efficacy between the treatment groups at the midway point of the trial.