This site became the new on June 19th. Learn more.
Show more Menu IMPORTANT: Listing of a study on this site does not reflect endorsement by the National Institutes of Health. Talk with a trusted healthcare professional before volunteering for a study. Read more... Menu IMPORTANT: Talk with a trusted healthcare professional before volunteering for a study. Read more... Menu
Give us feedback

Bronchoscopy With Bronchial Biopsies Sub-study of: Persistence of Airway Inflammation and Remodeling in Asthma Remission

This study has been withdrawn prior to enrollment.
(No funding, study not done)
Information provided by:
Laval University Identifier:
First received: September 5, 2007
Last updated: February 10, 2011
Last verified: February 2011

This study aims at determining the patterns of asthma remission, the prevalence of these different patterns and the various factors associated with such remissions and possible recurrences of asthma, in order to determine the mechanisms involved in these processes.

We therefore want to document these specificities in studying biopsies of subjects in complete remission of their asthma and those in only symptomatic remission of their asthma, in comparison with mildly symptomatic asthmatic subjects and healthy controls.


Study Type: Observational
Study Design: Observational Model: Case Control
Time Perspective: Cross-Sectional
Official Title: Bronchoscopy and Bronchial Biopsies. Sub-study of: Characteristics of Asthma Remissions

Resource links provided by NLM:

Further study details as provided by Laval University:

Biospecimen Retention:   Samples With DNA
Tissue (bronchial biopsies)

Estimated Enrollment: 36
Study Start Date: September 2007
Estimated Study Completion Date: March 2011
Subjects with complete remission of asthma
Subjects with symptomatic remission of asthma
Subjects with asthma
Healthy controls

Detailed Description:

Primary Outcome Measures :

Airway inflammation and remodeling: in bronchial biopsies

Secondary Outcome Measures:

Comparisons of bronchial biopsy features between groups:

  • Bronchial epithelial morphology
  • Bronchial mucosa (smooth muscle, reticular basement membrane, submucosal gland,...)

Ages Eligible for Study:   18 Years to 65 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
Subjects with current asthma or in remission of asthma from primary care clinics will be allowed to participate to this study. Healthy subjects will also be invited by advertisements in newspapers to volunteer for this study.

Inclusion Criteria:

  • In remission of their asthma: absence of respiratory symptoms, no rescue asthma medication need and (for complete remission) an optimal pulmonary function (FEV1 > 90%) and normal PC20 methacholine for more than two years (with no current treatment).
  • With a proven past history of asthma from medical files (reversible airway obstruction (> 12% FEV1 after bronchodilator or 20% by other means) proven by spirometry, PEF measures or methacholine challenge according to current criteria + previous symptoms and asthma medication use), having no more asthma symptoms and not having used asthma medication for more than 2 years.
  • Agree to sign the consent form.
  • No other condition that could interfere with the study measurements.

Exclusion Criteria:

  • Subjects using inhaled or oral anti-inflammatory agents.
  • FEV1 < 1.2 L.
  • Unable to adhere to the protocol requirements.
  • Other current respiratory disease
  • Upper or lower respiratory tract infection or use of antibiotics < 1 month.
  • Use of oral corticosteroids within the last 3 months.
  • Signs or symptoms of progressive or uncontrolled renal, hepatic, hematologic, endocrine, pulmonary, cardiac, neurologic or cerebral disease.
  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 identifier: NCT00526344

Canada, Quebec
Centre de Recherche, Hôpital Laval
Québec, Quebec, Canada, G1V 4G5
Sponsors and Collaborators
Laval University
Principal Investigator: Louis-Philippe Boulat, MD Hôpital Laval
  More Information

Responsible Party: Louis-Philippe Boulet, Laval Hospital Identifier: NCT00526344     History of Changes
Other Study ID Numbers: HL-07- sep-biop
Study First Received: September 5, 2007
Last Updated: February 10, 2011

Keywords provided by Laval University:
remission of asthma

Additional relevant MeSH terms:
Bronchial Diseases
Respiratory Tract Diseases
Lung Diseases, Obstructive
Lung Diseases
Respiratory Hypersensitivity
Hypersensitivity, Immediate
Immune System Diseases processed this record on August 18, 2017