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Blood type clues to asthma Flare-Ups?

NCT ID NCT00201266

Knowledge-focused Sponsor: University of California, San Francisco Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study looked at whether a person's blood group antigens are linked to asthma attacks. Researchers followed 126 people with asthma to see if certain blood types had more flare-ups requiring steroids. The goal was to understand, not treat, the disease.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Participants

126 people

The number who actually took part.

Start date

Jul 2005

Finished

Aug 2013

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Who is studied

Asthmatics of two types: 1. Exacerbation resistant asthma (no requirement for prednisone for asthma since age 12). 2. Exacerbation prone asthma (requirement for prednisone for asthma in the past 2 years).

Ages

18 to 75 years

Sex

Anyone

Healthy volunteers

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Diagnosis of asthma, as confirmed by methacholine responsiveness less than 8 mg/mL * History of asthma exacerbation in the 2 years prior to study entry requiring treatment with oral corticosteroids Exclusion Criteria: * Cigarette smoking in the 10 years prior to study entry or total pack per year history greater than 10 * History of asthma exacerbations requiring treatment with oral corticosteroids since age 12 (control group)

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Conditions

The condition(s) this trial relates to.

asthma lung disorder

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Asthma Lung diseases

Contacts and locations

Locations

  • University of California, San Francisco

    San Francisco, California, 94143, United States

More trials for these conditions

Other studies related to the condition(s) this trial covers.