DARWIN Study: A Randomization/Withdrawal Efficacy Study of Dexloxiglumide in Constipation-Predominant Irritable Bowel Syndrome (C-IBS)

Irritable Bowel Syndrome Clinical Trial

Official title:

A 24-wk, Prospective, d/b, Placebo Controlled, Parallel Group, Multicenter, Randomized/Withdrawal Efficacy and Safety Study of Dexloxiglumide for the Relief of Symptoms in Patients With Constipation-Predominant Irritable Bowel Syndrome

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT00220090
• Other study ID #: DEX-MD-05
• Secondary ID: DARWIN Study
• Status: Completed
• Phase: Phase 3
• First received: September 13, 2005
• Last updated: May 13, 2008
• Start date: July 2003

Study information

• Verified date: May 2008
• Source: Rottapharm
• Contact: n/a
• Is FDA regulated: No
• Health authority: United Kingdom: Medicines and Healthcare Products Regulatory AgencyGermany: Federal Institute for Drugs and Medical DevicesItaly: Ministry of HealthPoland: Ministry of HealthSwitzerland: Swissmedic
• Study type: Interventional

Clinical Trial Summary

Irritable Bowel Syndrome (IBS) is the most commonly identified functional gastrointestinal disorder, affecting 10-20% of the population in the Western world, seen predominantly in females and with a negative impact on quality of life, characterized by recurrent and often disabling abdominal pain associated with altered frequency or appearance or passage of the stool.

IBS aetiology is unknown and its treatment remains largely empirical and directed to the relief of symptoms. One possible target for IBS treatment has been identified in drugs that modulate the action of Cholecystokinin (CCK), a peptide gut hormone implicated in the regulation of motor and sensory functions at various levels of the gastrointestinal tract.

The biological actions of CCK in the gastrointestinal tract are mediated by CCK1-receptors.

Dexloxiglumide is an oral potent and selective antagonist of CCK1-receptors. The mechanism by which dexloxiglumide might be beneficial in IBS is its ability to modulate visceral hypersensitivity and gut dysmotility.

The DARWIN study has been designed to confirm the efficacy of dexloxiglumide according to a so-called randomized/withdrawal design. In this design all participants start the study treatment and only improved patients (the "responders") are randomized to active treatment or placebo, expecting a more frequent and/or a more rapid relapse of their symptoms in patients randomised to placebo than those on active.

Female and male patients, aged 18-70 yrs meeting IBS diagnostic criteria whose main complain is constipation, with a disease of at least moderate severity, will receive dexloxiglumide or placebo during a double-blind treatment phase of 24 weeks, following a first treatment of up to 12 wks during which patients will have to qualify as "responders" to the study treatment.

The responder status of each patient over each 4-wk assessment period, will be based on a weekly global patient-based assessment of relief and control of symptoms using a telephone/internet-based diary.

Additional secondary efficacy parameters will include: effect of treatment on IBS cardinal symptoms (e.g. abdominal discomfort/pain, bloating, straining, incomplete evacuation, urgency, stool frequency and consistency), on rescue laxative consumption, and on quality of life.

Standard safety parameters include vital signs, adverse event reporting, physical examination, routine laboratory screen, 12-lead ECG and gallbladder ultrasound.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 0
• Est. primary completion date: September 2006
• Accepts healthy volunteers: No
• Gender: Both
• Age group: 18 Years to 70 Years

Eligibility

Inclusion Criteria:

• Rome II criteria for IBS and manifesting supportive symptoms for the sub-classification of C-IBS, with a disease of at least moderate severity.

Exclusion Criteria:

• standard exclusions apply

Study Design

Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Parallel Assignment, Masking: Double-Blind, Primary Purpose: Treatment

Related Conditions & MeSH terms

• Constipation
• Irritable Bowel Syndrome
• Syndrome

Intervention

Drug:
• dexloxiglumide

Locations

Country	Name	City	State
United Kingdom	Academic Department of Medicine Wythenshawe Hospital	Manchester

Sponsors (1)

Lead Sponsor	Collaborator
Rottapharm

Country where clinical trial is conducted

United Kingdom, 

References & Publications (4)

Camilleri M. Management of the irritable bowel syndrome. Gastroenterology. 2001 Feb;120(3):652-68. Review. — View Citation

The European Agency for the Evaluation of the Medicinal Products (EMEA) - Committee for Proprietary Medicinal Products (CPMP). Draft "Points to consider on the Evaluation of Medicinal Products for the Treatment of Irritable Bowel Syndrome". Document N. CPMP/EWP/785/97 dated 25 April 2002.

Thompson WG, Longstreth GF, Drossman DA, Heaton KW, Irvine EJ, Müller-Lissner SA. Functional bowel disorders and functional abdominal pain. Gut. 1999 Sep;45 Suppl 2:II43-7. Review. — View Citation

Veldhuyzen van Zanten SJ, Talley NJ, Bytzer P, Klein KB, Whorwell PJ, Zinsmeister AR. Design of treatment trials for functional gastrointestinal disorders. Gut. 1999 Sep;45 Suppl 2:II69-77. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Time to relapse, i.e. loss of responder status, which is based on a global patient-based weekly assessment of relief and control of symptoms
Secondary	abdominal discomfort/pain
Secondary	bloating
Secondary	straining
Secondary	incomplete evacuation
Secondary	urgency
Secondary	stool frequency and consistency
Secondary	quality of life