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300 men with klinefelter syndrome to be tracked for decades in landmark study

NCT ID NCT07142135

Knowledge-focused Sponsor: Rigshospitalet, Denmark 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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jun 26, 2026

Summary

This study will follow 300 men with Klinefelter syndrome (an extra X chromosome) who are treated at a Danish hospital. Researchers will collect medical records, scans, and blood samples to map how the condition affects growth, hormones, fertility, heart health, and mental well-being over time. The goal is to fill knowledge gaps and improve care for this often-underdiagnosed condition.

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 lead to better guidelines for treating and monitoring Klinefelter syndrome, improving long-term health and quality of life for affected men.
What could go wrong
This is an observational study, not a treatment trial, so it won't directly test a new therapy. Results may take years and might not change current care quickly.

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 300 people

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

Started

Apr 2025

Expected to finish

Jan 2035

An estimate. End dates often move.

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

Approximately 300 patients with these diagnoses are currently followed at The Department of Growth and Reproduction and are eligible for inclusion in this study.

Ages

Children (under 18), adults (18 to 64) and older adults (65 and over)

Sex

Male participants only

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: * Patients with karyotype 47,XXY or variants as mentioned above who are followed at the Department of Growth and Reproduction, Rigshospitalet, Denmark, can be included in the study. Exclusion Criteria: * There are no exclusion criteria.

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Conditions

The condition(s) this trial relates to.

Klinefelter syndrome

As listed by the trial registrant

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

Klinefelter 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

    The full official record for this study. This one lists no contact details, but it is the first place any would appear.

    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

  • Copenhagen University Hospital, Rigshospitalet, Department of Growth and Reproduction

    Copenhagen, 2100, Denmark

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