Inflammatory Bowel Disease Clinical Trial
Official title:
A Double-blind, Randomized, Placebo-controlled Multicenter Study to Assess the Safety and Efficacy of AST-120 in Mild to Moderately Active Crohn's Patients With Fistulas
The objective of this study is to evaluate the safety and effectiveness of the experimental drug AST-120 in treating patients with mild to moderately severe Crohn's disease who have fistulas. The study will test whether or not patients receiving AST-120 experience a greater reduction in number of draining fistulas and improvement of their other Crohn's disease symptoms versus patients who receive placebo (material that does not contain any active medication).
The experimental drug AST-120 is composed of black, odorless spherical carbon particles in
2g sachets (aluminum foil pouches). The placebo consists of microcrystalline cellulose
spheres, Celphere CP-305, stained to match the appearance of AST-120, in 2g sachets
(aluminum foil pouches). Both AST-120 and placebo are oral (taken by mouth)preparations.
Both are tasteless. To take the product, patients will tear open the sachets, drop the
contents directly on their tongue and wash it down with 8 ounces of water.
Patients will be randomly assigned (like the toss of a coin), to receive either AST-120 or
placebo. Patients will have a 50/50 chance of receiving placebo. Patients who participate in
this study will be required to take a single dose of study drug (AST-120 or placebo) 3 times
a day, 30 minutes after a meal, for 8 weeks, and be evaluated at Week 4 and Week 8. This is
a 'blinded' treatment, which means that neither the patient nor the study doctor will know
if the patient has received study drug or placebo.
If, at the end of the first full course of randomized treatment, (8 weeks), patients are not
showing an improvement in their condition, they may have the option to receive the alternate
blinded treatment for one treatment course (8 weeks). The study doctor will discuss this
option with each patient individually. During this second course of treatment, patients will
be evaluated at Week 12 and Week 16. If the patient does not respond to the alternate
blinded treatment, or their condition worsens after 4 weeks (assessed at Week 12), they may
be removed from the study at the discretion of the investigator.
If patients respond to either the initial treatment or the alternate blinded treatment, they
will have monthly doctor/clinic visits for up to 6 months (Week 24), or until their
condition worsens or they relapse. Patients will not receive any study drug during this
follow-up period.
Relapse is defined for this study as:
- an increase by 1 or more in the number of draining fistulas for 2 sequential visits
versus the number present at the time of response (response is defined as at least a
50% reduction in the number of draining fistulas at either Week 8, or for those
patients receiving alternate blinded treatment, Week 16).
There are a maximum of 8 patient evaluation visits in this study (Screen, Baseline, Week 4,
Week 8, Week 12, Week 16, Week 20 and Week 24). Evaluations at most of these visits include
a review of concomitant medications, medical history/adverse events, physical exam, fistula
exam, blood draws for safety labs, urine pregnancy tests for females, and measurement of
body weight. Patients will also be asked to keep a daily diary to record frequency of bowel
movements, general well-being, and use of antidiarrheal medication.
Treatment failure in this study is defined by one or more of the following occurring prior
to Week 8:
- The need for additional therapies or dose increase for treatment of Crohn's disease,
including an increase of corticosteroid dose to higher than baseline
- Clinical/symptomatic development of an abscess
- Clinical/symptomatic evidence of stricture
- The need for surgical intervention for Crohn's disease
- The patient withdraws from the study
Patients will be discontinued from the study at any time if one or more of the following
complications occur:
- Development of an abscess or symptomatic stricture
- The need for surgical intervention for Crohn's disease
- Occurrence of any other event that in the opinion of the investigator warrants
discontinuation of the patient from the study
In addition, patients whose CDAI score has risen by > or = 70 points above baseline or risen
above 400 will be discontinued from the study.
Administration of any additional therapies or dose increases of concomitant medications
(including corticosteroids) to control Crohn's disease to higher than baseline while
receiving study drug (initial randomized treatment or alternate blinded treatment) will
require discontinuation of the patient from the study.
Discontinued patients will be evaluated in a termination visit to document the lack of
treatment efficacy and no further study treatment will be given.
;
Allocation: Randomized, Endpoint Classification: Safety/Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor), Primary Purpose: Treatment
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