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Scientists track rare family condition to uncover hidden clues about blood disorder

NCT ID NCT00091871

Knowledge-focused Sponsor: National Institute of Allergy and Infectious Diseases (NIAID) Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
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
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 25, 2026 · Last updated Sep 17, 2026 · Updated 14 times

Summary

This study follows about 50 members of a family with a rare inherited condition called familial hypereosinophilia, where high levels of a type of white blood cell can damage the heart and nerves. Researchers will track participants over many years with yearly checkups, blood tests, and heart and lung tests to understand how the condition develops and what causes it. The goal is to find genetic markers and early signs of disease progression, which could lead to better monitoring and future treatments.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

What this could lead to
If successful, this study could reveal genetic causes and early warning signs of familial hypereosinophilia, pointing toward better monitoring or future treatments.
What could go wrong
This is an observational study with only 50 participants from one family, so findings may not apply to others. It does not test any treatment, so no direct benefit is guaranteed.

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

About 50 people

The number the study aims to enrol. It can still change while the study runs.

Started

Jun 2005

Lead sponsor

A government research agency

The lead sponsor is the US National Institutes of Health.

Who can take part

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

Who is studied

Affected family members from the previously identified family with FE, as well as affected member of newly identified families with FE and unaffected family members from known families with FE, may enroll.

Ages

1 year to 100 years

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

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: In order to be eligible to participate in this study, an individual must meet all of the following criteria: * Stated willingness to comply with all study procedures and availability for the duration of the study * Male or female, aged 1-100 years of age * Genetically related member of a previously identified family with FE * Ability of subject to understand and the willingness to sign a written informed consent document. EXCLUSION CRITERIA: An individual who meets any of the following criteria will be excluded from participation in this study: * Any condition that the investigator feels put the subject at unacceptable risk for participation in the study * Pregnancy (in family members who do not have eosinophilia)

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Conditions

The condition(s) this trial relates to.

Eosinophilia eosinophilia, familial hypereosinophilic syndrome

As listed by the trial registrant

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

Eosinophilia Hypereosinophilic syndrome

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    1 site. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • National Institutes of Health Clinical Center

    RECRUITING

    Bethesda, Maryland, 20892, United States

More trials for these conditions

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