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Acid Reflux and Stromal Fibroblasts in Barrett's Esophagus

This study has been completed.
Information provided by (Responsible Party):
Prasad G. Iyer, Mayo Clinic Identifier:
First received: December 12, 2007
Last updated: January 16, 2013
Last verified: January 2013

Patients with Barrett's Esophagus are known to have excessive distal esophageal acid exposure comparable to patients with erosive esophagitis. A significant proportion of patients with BE who are not symptomatic on treatment continue to have persistent acid reflux. High dose esomeprazole is able to control acid reflux in patients with BE. The effect of acid reflux on Barrett's esophagus stroma is currently unknown.

It is our hypothesis that stromal fibroblast activation in Barrett's esophagus is influenced by acid reflux. The specific aim of this proposal will be: To assess the association between acid reflux and subepithelial fibroblasts in Barrett's esophagus.

Condition Intervention Phase
Barrett's Esophagus
Procedure: Endoscopy and pH study
Phase 1

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Diagnostic
Official Title: Acid Reflux and Stromal Fibroblasts in Barrett's Esophagus

Resource links provided by NLM:

Further study details as provided by Mayo Clinic:

Primary Outcome Measures:
  • The specific aim of this proposal will be: To assess the association between acid reflux and subepithelial fibroblasts in Barrett's esophagus. [ Time Frame: end of study ]

Enrollment: 16
Study Start Date: August 2007
Study Completion Date: January 2011
Primary Completion Date: January 2011 (Final data collection date for primary outcome measure)
Intervention Details:
    Procedure: Endoscopy and pH study
    endoscopy and PH study done one time
Detailed Description:

We will conduct a prospective cohort study to assess the degree of stromal activation in patients with LSBE (without dysplasia) who have adequate and inadequate control of acid reflux in the distal esophagus. The study will be conducted in two phases.

Phase 1 (Pilot): 20 patients with LSBE without dysplasia will undergo endoscopy with biopsies and a 24 hour pH study on treatment. Patients will then be divided into 2 groups:

  • Group A (GER): Those with ongoing acid reflux (characterized by either presence of esophagitis [LA classification B,C or D1] on endoscopy, and/or a positive pH study on treatment defined using standard criteria)
  • Group B (NGER): Those with controlled acid reflux (negative endoscopy and pH study on treatment).

Stromal markers that will be assessed and compared between the 2 groups will include: presence of activated myofibroblasts (detected by immunohistochemistry for vimentin and smooth muscle actin).


Ages Eligible for Study:   18 Years to 80 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Prior histological demonstration of Barrett's esophagus that is endoscopically visible; length of visible segment >/= 1 cms
  • Absence of dysplasia on prior biopsies
  • Laboratory studies:

    • Prothrombin time (INR) < 1.5
    • Hemoglobin > 8.0 gm/dL
  • Ability to provide informed consent

Exclusion Criteria:

  • Eastern Cooperative Oncology Group performance status 3 or 4
  • Inability to tolerate endoscopic procedures
  • Pregnancy: Females of child-bearing age will be screened with pregnancy test. Although none of the procedures in the study are contraindicated in pregnancy, sedation used in endoscopy can be contraindicated in early pregnancy
  • Prior esophageal surgery, or cancer
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Please refer to this study by its identifier: NCT00573911

United States, Minnesota
Mayo Clinic
Rochester, Minnesota, United States, 55905
Sponsors and Collaborators
Mayo Clinic
Principal Investigator: Prasad G Iyer, M.D. Mayo Clinic
  More Information

Responsible Party: Prasad G. Iyer, PI, Mayo Clinic Identifier: NCT00573911     History of Changes
Other Study ID Numbers: 07-002453
Study First Received: December 12, 2007
Last Updated: January 16, 2013

Keywords provided by Mayo Clinic:
Barrett's esophagus

Additional relevant MeSH terms:
Barrett Esophagus
Gastroesophageal Reflux
Digestive System Abnormalities
Digestive System Diseases
Esophageal Diseases
Gastrointestinal Diseases
Esophageal Motility Disorders
Deglutition Disorders processed this record on May 23, 2017