CYP2C19 Genetic Polymorphism on the Accuracy of Proton-Pump Inhibitor Testing

This study has been completed.
Information provided by (Responsible Party):
National Taiwan University Hospital Identifier:
First received: July 18, 2006
Last updated: November 30, 2012
Last verified: November 2012

Background/Aim: To evaluate the optimal dosage of rabeprazole for proton-pump inhibitor (PPI) testing of gastroesophageal reflux disease (GERD) and to test the influence of cytochrome P (CYP) 2C19 polymorphism in a population with a high prevalence of people who poorly metabolize PPIs.

Patients and Methods: In this randomized, open-label trial, patients with symptoms suggestive of GERD were randomized to receive a two-week test with 20-mg or 40-mg rabeprazole after diagnostic endoscopy. Symptom response was assessed with a four-grade daily record; in addition, DNA from peripheral blood leukocytes was genotyped for CYP2C19 polymorphism with polymerase chain reaction-restrict fragment length polymorphism (PCR-RFLP) technique.

Condition Intervention Phase
Drug: rabeprazole
Phase 4

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Efficacy Study
Intervention Model: Parallel Assignment
Masking: Open Label
Primary Purpose: Diagnostic
Official Title: The Influence of CYP2C19 Genetic Polymorphism and Dosage of Rabeprazole on the Accuracy of Proton-Pump Inhibitor Testing in Chinese Patients With Gastroesophageal Reflux Disease

Resource links provided by NLM:

Further study details as provided by National Taiwan University Hospital:

Primary Outcome Measures:
  • Symptom response with a four-grade daily record. [ Time Frame: 2 weeks ] [ Designated as safety issue: No ]
    GERD symptom assessment

Secondary Outcome Measures:
  • CYP2C19 polymorphism [ Time Frame: 2 weeks ] [ Designated as safety issue: No ]

Enrollment: 200
Study Start Date: June 2005
Study Completion Date: December 2008
Primary Completion Date: June 2008 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: 2 arms
Drug: rabeprazole
Active Comparator: PPI
Drug: rabeprazole

  Show Detailed Description


Ages Eligible for Study:   20 Years to 80 Years
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • A consecutive series of patients with symptoms suggestive of GERD were enrolled from the Gastroenterology outpatient clinic in our institution. The typical GERD symptom was defined as heartburn and/or acid regurgitation of at least three episodes per week for a minimum of three months.

Exclusion Criteria:

  • Patients who received concurrent PPI treatment, had a medical contraindication to rabeprazole therapy, reported a history of peptic ulcer disease or gastrointestinal surgery, peptic ulcer disease or malignancy proven by endoscopy, the presence of alarm features (e.g., dysphagia, weight loss, bleeding, abdominal mass, and/or anemia), or who were unwilling or unable to provide informed consent were excluded from the study.
  Contacts and Locations
Please refer to this study by its identifier: NCT00354757

National Taiwan Univeristy Hospital
Taipei, Taiwan, 100
Sponsors and Collaborators
National Taiwan University Hospital
Study Director: Ming-Shiang Wu, PHD National Taiwan University Hospital
  More Information

No publications provided

Responsible Party: National Taiwan University Hospital Identifier: NCT00354757     History of Changes
Other Study ID Numbers: 940711, 940711
Study First Received: July 18, 2006
Last Updated: November 30, 2012
Health Authority: Taiwan: Department of Health

Keywords provided by National Taiwan University Hospital:
gastroesophageal reflux disease, proton-pump inhibitor test

Additional relevant MeSH terms:
Gastroesophageal Reflux
Esophageal Motility Disorders
Deglutition Disorders
Esophageal Diseases
Gastrointestinal Diseases
Digestive System Diseases
Proton Pump Inhibitors
Enzyme Inhibitors
Molecular Mechanisms of Pharmacological Action
Pharmacologic Actions
Anti-Ulcer Agents
Gastrointestinal Agents
Therapeutic Uses processed this record on April 16, 2014