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Tiny study checks if new brain scanner tracer works reliably

NCT ID NCT03649555

Knowledge-focused Sponsor: Stanford University 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 26, 2026 · Last updated Aug 14, 2026 · Updated 2 times

Summary

This study tested how reliably a new radioactive tracer, [18F]-FTC-146, shows up in brain scans of healthy people. Five volunteers received the tracer on two separate days to see if the results were consistent. The goal was to understand the tracer's stability, not to treat any condition.

What this could mean

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

Active substance
[18F]-FTC-146 (a radioactive tracer for brain imaging)
What this could lead to
If successful, this could help develop a reliable way to measure sigma-1 receptors in the brain, which may aid future research into neurological conditions.
What could go wrong
This is a very early, small study with only 5 healthy participants. It is designed to test reliability, not to treat any disease, so it may not lead to any direct medical benefit.

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

Phase 1

The first testing in people. Mainly checks safety and dose, usually in a small group.

Participants

5 people

The number who actually took part.

Started

Feb 2019

Finished

Mar 2021

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

18 to 65 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: 1. ages 18-65 2. either gender and all ethno-racial categories 3. capacity to provide informed consent 4. Female participants are expected to use an effective method of birth control throughout the study Exclusion Criteria: 1. Any current or lifetime psychiatric diagnosis 2. Current or past use of psychotropic medication 3. Pregnant or nursing females 4. Major medical or neurological problem 5. Presence of metal in the body that is contraindicated for MRI scans

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As listed by the trial registrant

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

Healthy controls

Contacts and locations

Locations

  • Department of Psychiatry and Behavioral Sciences

    Stanford, California, 94304, United States

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