Safety and Efficacy of AST-120 in the Treatment of Antibiotic-Refractory Pouchitis

Sponsor

Ocera Therapeutics (Industry)

Overall Status

Terminated

CT.gov ID

NCT00583531

Collaborator

(none)

Enrollment

Location

Arm

21.1

Duration (Months)

0.1

Patients Per Site Per Month

Study Details

Study Description

Brief Summary

This is an open-label pilot study in which all patients will receive AST-120 for 4 weeks. Patients will discontinue antibiotics at study entry. They may continue other previously prescribed treatments (e.g., probiotics and/or nutritional agents) at the discretion of the study doctor. The purpose of the study is to assess whether the investigational medication AST-120 will be a safe and effective treatment for the symptoms of pouchitis, a chronic inflammatory condition, in patients whose symptoms have not responded well to antibiotics. An initial group of 10 patients will be enrolled. If there are no serious side effects associated with the study drug and at least 3 of the 10 patients respond, a second group of 10 patients may be enrolled. Patients will have clinic visits at the start of the study and at week 4. Patients will be checked by phone on a weekly basis for symptom response, compliance and development of side effects. Endoscopies will be performed at the start of the study and at week 4 or early termination.

Condition or Disease	Intervention/Treatment	Phase
Pouchitis	Drug: AST-120	Phase 2

Detailed Description

Patients with acute pouchitis are typically treated with metronidazole or ciprofloxacin for 10-14 days. Most patients with pouchitis respond to these or other antibiotics. Patients who experience frequent relapses and those with chronic pouchitis will require long term maintenance antibiotics. Probiotics may be considered as an alternate to chronic antibiotic therapy for maintenance of remission in chronic antibiotic-dependent pouchitis. In practice, we would institute maintenance therapy for patients who relapse at least 3 times within one year, or within 1 month of discontinuation of antibiotics. Among patients receiving maintenance antibiotics who develop loss of clinical benefit after prolonged treatment, rotation of three or four antibiotics in 1-week intervals may be beneficial. Patients who do not improve with single antibiotics may respond to combination therapy with two antibiotics. If not, they can be treated with topical or oral budesonide. Other options include topical mesalamine (enemas or suppositories), oral sulfasalazine or mesalamine, other topical or oral steroids, and possibly oral bismuth, azathioprine, 6-mercaptopurine or infliximab. However, there is little evidence base for these therapies in the literature, and many of these therapies are expensive and/or potentially toxic. A therapy that does not suppress the immune system, and that has little or no toxicity would be attractive for patients with antibiotic-refractory pouchitis.

AST-120 is manufactured by Kureha Corporation, Japan. The agent was approved in Japan in 1991 for the treatment of patients with chronic kidney disease(CKD). It is comprised of highly adsorptive, porous, spherical carbon particles and is packaged in 2 g sachets for oral administration designed for the treatment of gastrointestinal diseases. AST-120 consists of black microspheres approximately 0.2-0.4 mm in diameter with high adsorption ability and large surface area. Composed mainly of carbon (approximately 96%), the clinical utility of AST-120 is thought to reside in its ability to adsorb small molecular weight toxins, inflammatory mediators, and harmful bile acid products from the gastrointestinal tract, preventing local toxicity and their systemic absorption. AST-120 has a selective adsorption profile for certain acidic and basic organic compounds, and has a significantly lower adsorptive capacity than activated charcoal for digestive enzymes.

In this study, patients with active pouchitis after ileal pouch-anal anastomosis (IPAA) for Ulcerative Colitis with primary symptoms such as increased stool frequency and abdominal pain, and refractory to antibiotics (do not respond to antibiotic therapy for a minimum of 14 days) will be enrolled. Patients must have active pouchitis confirmed by endoscopy and biopsy within 4 weeks of study entry. The diagnosis of active pouchitis will be defined by a PDAI score >7 points, with a combined assessment of symptoms, endoscopy and histology.

Eligible patients will receive AST-120 sachets at 2g three times daily (TID) to be taken between meals at 10:00 am, 3:00 pm and immediately before going to bed for 4 complete weeks. AST-120 is a tasteless, odorless, oral preparation. 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 evaluated at baseline and week 4 or early termination by the study physician, including endoscopies with histology and routine laboratory tests. Patients will be checked on a weekly basis by the study coordinator by phone for symptom response, compliance, and development of adverse events. Quality of Life Assessments (Cleveland Global Quality of Life and Short Inflammatory Bowel Questionnaire) will be conducted at baseline and week 4 or early termination. A patient is defined as having completed study treatment if he/she has received investigational product and is followed for safety through the last on-site visit of the 4 week treatment course.

Any co-prescribed medicine must be given at least 30 minutes before AST-120 administration. The following drugs for pouchitis can be co-prescribed/maintained during AST-120 treatment and their utilization will be recorded as secondary endpoints:

Antidiarrheal therapy with loperamide (Imodium)
Nutritional agents and Probiotics at the same dose as previously prescribed, if the dose has been stable for 2 weeks at study entry.

Antibiotics must be stopped by the time of entry into the study. However, antibiotics prescribed to treat infection other than pouchitis will be allowed and recorded.

The need to prescribe any of the following drugs during the study will constitute treatment failure:

Oral or topical corticosteroids
Oral or topical 5-ASA
Nutritional agents (SCFA enemas or suppositories, glutamine, dietary fibers)
Probiotics
Narcotic-based antidiarrheal agents

In addition patients will be considered to have failed treatment if they have a PDAI score improvement of < or = 2 points at the end of the trial. Patients will be discontinued from the study if they become pregnant or if warranted by treatment-emergent safety concerns or if, in the opinion of the investigator, it is in the patient's best interest to discontinue the study.

A first cohort of 10 patients will be treated; based on outcome (efficacy and safety: no significant Adverse Event (AE) associated with study drug and at least 3/10 patients responding) a second cohort of 10 patients may be enrolled.

Study Design

Study Type:

Interventional

Actual Enrollment :

2 participants

Allocation:

N/A

Intervention Model:

Single Group Assignment

Masking:

None (Open Label)

Primary Purpose:

Treatment

Official Title:

A Pilot Study of the Safety and Efficacy of AST-120 in the Treatment of Antibiotic-Refractory Pouchitis

Study Start Date :

Mar 1, 2007

Actual Primary Completion Date :

Dec 1, 2008

Actual Study Completion Date :

Dec 1, 2008

Arms and Interventions

Arm	Intervention/Treatment
Experimental: I Active treatment with AST-120	Drug: AST-120 Oral, 2 grams TID in sachets for 4 weeks

Arm

Intervention/Treatment

Experimental: I

Active treatment with AST-120

Drug: AST-120

Oral, 2 grams TID in sachets for 4 weeks

Outcome Measures

Primary Outcome Measures

Response as defined by a decrease in the Pouchitis Diseases Activity Index (PDAI) score of at least 3 points [4 weeks]
Safety: Any adverse events (AEs) deemed possibly, probably, or definitely related to treatment with investigational product during 4 weeks of treatment [4 weeks]

Secondary Outcome Measures

Remission, as defined as a PDAI score of less than 7 points [4 weeks]
Reduction of PDAI clinical symptom subscore of at least 1 point [4 weeks]
Reduction of PDAI endoscopic subscore of at least 1 point [4 weeks]
Reduction of PDAI histology subscore of at least 1 point [4 weeks]
Need for rescue medication/quantity of antidiarrheal medication used during the last week of the trail compared to usage in the week prior to study entry [4 weeks]
Quality of Life as measured by the Cleveland Global QoL instrument and Short Inflammatory Bowel Disease Questionnaire (SIBDQ) [4 weeks]
Significant change in clinical laboratory tests [4 weeks]
Worsening GI symptoms (diarrhea, abdominal pain, urgency or bleeding) or new GI and extra-GI symptoms (e.g., headache, nausea, vomiting, constipation) [4 weeks]
Significant change in physical examination, including vital signs (blood pressure, heart rate, respiration rate and temperature) [4 weeks]

Eligibility Criteria

Criteria

Ages Eligible for Study:

18 Years to 75 Years

Sexes Eligible for Study:

All

Accepts Healthy Volunteers:

Inclusion Criteria:

Patients with active pouchitis (defined as having a PDAI score > 7) after IPAA for UC, despite at least 14 days of antibiotic therapy. Active pouchitis must be confirmed by endoscopy and histology within 4 weeks of study entry
Able to give informed consent
Able and willing to comply with all study procedures

Exclusion Criteria:

Patients previously treated with infliximab or any investigational immunosuppressant/ immunomodulator for pouchitis
Patients undergoing chemotherapy for the treatment of cancer
Presence of other inflammatory diseases of the pouch: Crohn's disease, Cuffitis, active specific infection of the pouch: (e.g., CMV, C. difficile)
History of non-inflammatory disease of the pouch: decreased pouch compliance, irritable pouch syndrome, afferent or efferent limb obstruction, stricture of pouch
Ileal pouch patients with familial adenomatous polyposis
History of other diarrheal illnesses: lactose intolerance, celiac disease, small bowel bacterial overgrowth
Primary Sclerosing Cholangitis with or without liver transplant
Uncontrolled systemic disease
Needing oral or topical 5-ASA, cholestyramine, steroids or immunomodulators
Other major physical or major psychiatric illness within the last 6 months that in the opinion of the investigator would affect the patient's ability to complete the trial
Women who are pregnant, breast feeding, or planning to become pregnant during the study
Women of child-bearing potential who are not willing to use barrier or depot contraception methods
Use of NSAIDs or aspirin (>3 times per week) within the past 3 weeks

Contacts and Locations

Locations

	Site	City	State	Country	Postal Code
1	Mayo Clinic, Inflammatory Bowel Disease Clinic	Rochester	Minnesota	United States	55905

Sponsors and Collaborators

Ocera Therapeutics

Investigators

Principal Investigator: Darrell S. Pardi, MD, Mayo Clinic College of Medicine

Study Documents (Full-Text)

None provided.

More Information

Publications

Responsible Party:

Ocera Therapeutics

ClinicalTrials.gov Identifier:

NCT00583531

Other Study ID Numbers:

06-007216

First Posted:

Dec 31, 2007

Last Update Posted:

Jun 18, 2014

Last Verified:

Jun 1, 2014

Keywords provided by Ocera Therapeutics

Antibiotic-refractory Pouchitis

Pouchitis

Ulcerative Colitis

Additional relevant MeSH terms:

Pouchitis

Study Results

No Results Posted as of Jun 18, 2014