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Massive study aims to unlock secrets of rare vascular diseases

NCT ID NCT03538639

Knowledge-focused Sponsor: National Heart, Lung, and Blood Institute (NHLBI) 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 26, 2026 · Last updated Sep 18, 2026 · Updated 10 times

Summary

This study is collecting medical data and biological samples from people with genetic conditions affecting the heart and blood vessels, their relatives, and healthy volunteers. The goal is to better understand these diseases, improve diagnosis, and lay the groundwork for future treatments. Participants will undergo various tests like scans, blood draws, and heart function assessments.

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 research could improve diagnosis and understanding of rare vascular diseases, potentially paving the way for future treatments.
What could go wrong
This is an observational study, not a treatment trial. It may not directly lead to new therapies, and results depend on participant enrollment and data quality.

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 1,000 people

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

Started

Jul 2018

Expected to finish

May 2037

An estimate. End dates often move.

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

We expect to enroll an unlimited number of subjects. The study population will be divided into groups that reflect both the potential studies that may be performed in distinct groups and the risk to benefit analysis for these groups. The appendices at the end of the protocol describe possible procedures and risk profiles for all the study subjects. Vulnerable populations, including pregnant women, children and cognitively impaired persons, may participate in this study. The groups include: 1.Adult index cases (affected) and relatives (affected and unaffected) 2.Child index cases (affected) and child relatives (affected and unaffected) 3.Healthy adult volunteers

Ages

2 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: * All subjects must be between the ages of 2-100 years old. * Affected pregnant women if they have been referred with a known or suspected pathology or if they become pregnant while on study. * Unaffected related pregnant women (including spouses/partners) for cord blood and tissue collection (surgical waste) only at the time of delivery. EXCLUSION CRITERIA: * Healthy volunteers unable to give informed consent * Healthy volunteers who decline to have blood drawn and/or tissue studies or who do not consent to have samples stored for future research. * Cognitively impaired individuals who are not affected. * Cognitively impaired individuals not related to affected subjects. * Unaffected unrelated pregnant women.

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Conditions

The condition(s) this trial relates to.

inherited disease susceptibility Undiagnosed Diseases vascular disorder

As listed by the trial registrant

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

Genetic mutations Genetic predisposition Vascular dysfunction

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

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