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Frozen testicle tissue may help infertile men have kids

NCT ID NCT07364409

Disease control Sponsor: Herlev and Gentofte Hospital 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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This experimental study tests whether frozen-thawed testis tissue, when grafted under the skin, can produce sperm in men with infertility. Five men will receive their own stored tissue. The goal is to see if viable sperm can be retrieved, potentially offering a future fertility option for cancer survivors.

What this could mean

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

Active substance
Autologous transplantation of testis tissue
What this could lead to
If successful, this could offer a way for men who lost fertility due to cancer treatment to father biological children.
What could go wrong
This is a tiny, early-stage study with only 5 men. It may not produce viable sperm, and the procedure is experimental with unknown long-term safety.

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.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

5 people

The number who actually took part.

Started

Nov 2024

Expected to finish

Mar 2027

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.

Ages

40 years and older

Sex

Male participants only

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.

Men referred to the Department of Urology at Herlev and Gentofte Hospital for the treatment of hydrocele or spermatocele were provided with detailed information about the study and invited to participate. Written study information was distributed, and a mandatory reflection period of at least 24 hours was observed prior to obtaining consent. Inclusion Criteria: * Age ≥ 40 years * Scheduled for an elective hydrocele or spermatocele surgery * Willing to have a testis biopsy taken during the planned surgery * At least one biological child, unassisted spontaneous conception * No current or future fertility wishes * Written informed consent for the participation in this study Exclusion Criteria: * Treatment with testosterone substitution * Bleeding disorders that render surgery too high a risk * Other contraindications to surgery * Unable to give informed consent * Language difficulties that could compromise the informed consent or quality of examination

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Conditions

The condition(s) this trial relates to.

azoospermia cancer hematologic disorder male infertility neoplasm spermatogenic failure 3

As listed by the trial registrant

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

Azoospermia, nonobstructive Cancer Hematologic diseases Infertility, male

Contacts and locations

Locations

  • Copenhagen University Hospital - Herlev and Gentofte

    Herlev, Capital Region, 2730, Denmark

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