Randomized, Double-blind, Dose-range-finding, Phase 2 Study of Linaclotide Administered to Patients With Irritable Bowel Syndrome With Constipation (IBS-C) - Full Text View

Purpose

The purpose of this study is to determine the safety, efficacy, and dose response of a range of oral doses of linaclotide administered to patients meeting criteria for IBS-C.

Condition	Intervention	Phase
Irritable Bowel Syndrome With Constipation	Drug: Linaclotide Acetate Drug: Matching placebo	Phase 2


Study Type:	Interventional
Study Design:	Allocation: Randomized Intervention Model: Parallel Assignment Masking: Double Blind (Participant, Care Provider, Investigator, Outcomes Assessor) Primary Purpose: Treatment
Official Title:	A Randomized, Multicenter, Double-blind, Placebo-controlled, Dose-range-finding, Parallel-design, Phase 2 Trial of Oral Linaclotide Acetate Administered to Patients With Irritable Bowel Syndrome With Constipation

Resource links provided by NLM:

MedlinePlus related topics: Constipation

Drug Information available for: Linaclotide Linaclotide acetate

U.S. FDA Resources

Further study details as provided by Ironwood Pharmaceuticals, Inc.:

Primary Outcome Measures:

Change From Baseline in the Weekly Normalized Complete Spontaneous Bowel Movement (CSBM) Rate During Weeks 1 Through 12 of the Treatment Period [ Time Frame: Change from Baseline to Week 12 ]
The change in the weekly normalized CSBM Rate during Weeks 1 through 12 of the Treatment Period from the weekly normalized CSBM Rate obtained during the Pretreatment Period.

The CSBM rate was normalized based on the number of CSBMs occurring in that week, adjusting for differences in the duration of the week and black-out periods (time not covered due to a missed IVRS call) versus 7x24 hours.

Secondary Outcome Measures:

CSBM 75% Responder for the Treatment Period (Based on the Normalized Rate) [ Time Frame: Change from Baseline to Week 12 ]
For each week of the Treatment and Posttreatment Periods, a patient was considered a CSBM Responder if for that week the patient 1) completed ≥ 4 days of IVRS questions, 2) had a CSBM rate of ≥ 3 for the week, and 3) had an increase in CSBM rate of ≥ 1 from the baseline weekly CSBM rate.
Change From Baseline in the Weekly Normalized SBM Rate for the Treatment Period [ Time Frame: Change from Baseline to Week 12 ]
SBMs were measured daily during the treatment period by patient calls to the IVRS.
Change From Baseline in Stool Consistency (7-point Ordinal BSFS) for the Treatment Period [ Time Frame: Change from Baseline to Week 12 ]
Stool consistency analyses were performed using the 7-point Bristol Stool Form Scale (BSFS), whereby a score of 1 = separate hard lumps like nuts (difficult to pass); 2 = sausage shaped but lumpy; 3 = like a sausage but with cracks on surface; 4 = like a sausage or snake, smooth and soft; 5 = soft blobs with clear-cut edges (passed easily); 6 = fluffy pieces with ragged edges, a mushy stool; and 7 = watery, no solid pieces (entirely liquid).
Change From Baseline in Straining (5-point Ordinal Scale) for the Treatment Period [ Time Frame: Change from Baseline to Week 12 ]
Straining was assessed using a 5-point ordinal scale, whereby a score of 1 = not at all, 2 = a little bit, 3 = a moderate amount, 4 = a great deal, and 5 = an extreme amount.
Change From Baseline in Degree of Relief of Irritable Bowel Syndrome (IBS) Symptoms (7-point Balanced Scale) for the Treatment Period [ Time Frame: Change from Baseline to Week 12 ]
Patients provided a weekly assessment of Degree of Relief of IBS Symptoms using a 7-point balanced scale (1=completely relieved, 2=considerably relieved, 3=somewhat relieved, 4=unchanged, 5=somewhat worse, 6=considerably worse, 7=as bad as I can imagine).
Change From Baseline in Abdominal Pain (5-point Ordinal Scale) for the Treatment Period [ Time Frame: Change from Baseline to Week 12 ]
During the study, patients provided their self assessment of abdominal pain using a 5-point ordinal scale (1=none, 2=mild, 3=moderate, 4=severe, 5=very severe


Enrollment:	420
Study Start Date:	April 2007
Study Completion Date:	April 2008
Primary Completion Date:	February 2008 (Final data collection date for primary outcome measure)

Arms	Assigned Interventions
Active Comparator: 72 ug linaclotide acetate	Drug: Linaclotide Acetate Oral, once daily
Active Comparator: 145 ug linaclotide acetate	Drug: Linaclotide Acetate Oral, once daily
Active Comparator: 290 ug linaclotide acetate	Drug: Linaclotide Acetate Oral, once daily
Active Comparator: 579 ug linaclotide acetate	Drug: Linaclotide Acetate Oral, once daily
Placebo Comparator: Matching Placebo	Drug: Matching placebo Oral, once daily

Eligibility


Ages Eligible for Study:	18 Years and older (Adult, Senior)
Sexes Eligible for Study:	All
Accepts Healthy Volunteers:	No

Criteria

Inclusion Criteria:

Must not be pregnant or breastfeeding and agree to use birth control;
Completion of a negative colonoscopy as per American Gastroenterology Association (AGA) criteria and no clinically-significant laboratory or physical examination findings;
Meets protocol-defined criteria for IBS-C, including stool frequency, straining, stool consistency, abdominal pain, and abdominal discomfort criteria;
Demonstrates English fluency and has access to a touch-tone telephone.

Exclusion Criteria:

Recent history of mushy or watery stools;
Various medical conditions, medical histories, or family medical histories that would not make the patient a good candidate for the study;
Clinically-significant alarm symptoms;
Secondary causes of constipation or evacuation disorders;
Surgery to the gastrointestinal tract;
Usage of prohibited medications.

Contacts and Locations

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its ClinicalTrials.gov identifier: NCT00460811

Show 85 Study Locations

Sponsors and Collaborators

Ironwood Pharmaceuticals, Inc.

Investigators


Study Director:	Microbia Medical Director, MD	Microbia, Inc.

More Information

Publications automatically indexed to this study by ClinicalTrials.gov Identifier (NCT Number):

Johnston JM, Kurtz CB, Macdougall JE, Lavins BJ, Currie MG, Fitch DA, O'Dea C, Baird M, Lembo AJ. Linaclotide improves abdominal pain and bowel habits in a phase IIb study of patients with irritable bowel syndrome with constipation. Gastroenterology. 2010 Dec;139(6):1877-1886.e2. doi: 10.1053/j.gastro.2010.08.041. Epub 2010 Aug 27.


Responsible Party:	Ironwood Pharmaceuticals, Inc.
ClinicalTrials.gov Identifier:	NCT00460811 History of Changes
Other Study ID Numbers:	MCP-103-202
Study First Received:	April 13, 2007
Results First Received:	September 28, 2012
Last Updated:	January 29, 2013

Keywords provided by Ironwood Pharmaceuticals, Inc.:


Irritable Bowel Syndrome with Constipation IBS Irritable Bowel Syndrome	linaclotide acetate linaclotide MD-1100

Additional relevant MeSH terms:


Syndrome Constipation Irritable Bowel Syndrome Disease Pathologic Processes Signs and Symptoms, Digestive	Signs and Symptoms Colonic Diseases, Functional Colonic Diseases Intestinal Diseases Gastrointestinal Diseases Digestive System Diseases

ClinicalTrials.gov processed this record on June 23, 2017