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Identification of Asthma Phenotypes in Severe Asthmatics

This study is currently recruiting participants.
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Verified February 2017 by Singapore General Hospital
Information provided by (Responsible Party):
Singapore General Hospital Identifier:
First received: June 15, 2012
Last updated: February 9, 2017
Last verified: February 2017

Asthma is a heterogenous disease. Different patients have different presentations, course of disease and response to treatment.

The investigators would like to study our population of more severe asthma and find out about their profile - demographic, clinical and inflammatory.


Study Type: Observational
Study Design: Observational Model: Case-Only
Time Perspective: Prospective
Official Title: Identification of Asthma Phenotypes in Severe Asthmatics

Further study details as provided by Singapore General Hospital:

Estimated Enrollment: 500
Study Start Date: January 2011
Estimated Study Completion Date: January 2020
Estimated Primary Completion Date: January 2020 (Final data collection date for primary outcome measure)
severe asthma

Detailed Description:

Asthma is a heterogeneous disorder presenting with many phenotypes. Most asthmatics have mild to moderate disease. However, 5-20% of asthmatics belong to the "Difficult-to-treat" or more severe group and they account for 50-80% of asthma health care costs. In a tertiary hospital like Singapore General Hospital, most of our asthmatics belong to the more severe group. They have more frequent healthcare visits, hospitalizations, medication use and higher risks of death.

There is currently no local data on the phenotypic profile of our patients. Asthma phenotypes which have been identified include those related to triggers ( eg. drugs such as aspirin or NSAIDS, environmental allergen, occupational allergens or irritants, exercise) or clinical physiological phenotypes ( eg. severity-defined, exacerbation-prone, chronic airflow limitation, steroid-resistant, age -of -onset) or inflammatory phenotypes ( eg. eosinophilic, neutrophilic, pauci granulocytic, mixed). With better understanding of their phenotypes, treatment can then be individually tailored to improve their asthma control and reduce future risks.

We aim to improve the understanding of this group of asthmatics such that better treatment approaches can be developed in the future. This is not a clinical trial. Its purpose is to gather information ranging from demographic data, medical history to responses to simple routine questions, to lung function, inflammation, allergy and blood testing results. The data are analyzed to improve our understanding of the clinical and inflammatory phenotypes ( or profiles) in this group of patients.


Ages Eligible for Study:   21 Years to 80 Years   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Probability Sample
Study Population
Respiratory or asthma clinic

Inclusion Criteria:

  1. Difficult-to-treat severe asthma
  2. Treatment-resistant severe asthma patients who are partially or poorly controlled despite high dose inhaled corticosteroids ( ICS) or a high-dose ICS and long acting- beta-2- agonist combination ( LABA) and frequent or chronic use of systemic corticosteroids or
  3. Treatment-resistant severe asthma who are well-controlled on the highest level of recommended treatment to maintain control (high dose ICS or combination of high-dose ICS with other medications such as LABA, theophylline, montelukast, systemic corticosteroids, anti-Ig E, etc.
  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: NCT01623089

Singapore General Hospital Recruiting
Singapore, Singapore, 169608
Contact: Mariko Koh, MBBS    (65) 64699419   
Sponsors and Collaborators
Singapore General Hospital
Principal Investigator: Mariko Koh, MBBS Singapore General Hospital
  More Information

Responsible Party: Singapore General Hospital Identifier: NCT01623089     History of Changes
Other Study ID Numbers: 2010/810/C
Study First Received: June 15, 2012
Last Updated: February 9, 2017

Keywords provided by Singapore General Hospital:
severe asthma, phenotype, data

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 September 21, 2017