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Stomach bug treatment in teens could stop cancer before it starts

NCT ID NCT05926804

Disease control Sponsor: Miguel O'Ryan Gallardo 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This study tests a 'screen and treat' approach for H. pylori infection in 14-18 year olds in Chile, where stomach cancer rates are high. Researchers will screen up to 1000 teens and randomly assign 210 persistently infected participants to receive antibiotics or no treatment. They aim to see if eradication reduces signs of stomach damage and changes gut bacteria, with the goal of preventing future cancer.

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

About 500 people

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

Started

Aug 2022

Expected to finish

Aug 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

14 to 18 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. Healthy teenagers 14-18 years of age from Colina, Temuco or Coyhaique 2. At least one responsible adult family member accessible for phone contact. 3. Persistent H. pylori infection determined by at least 2 positive UBT tests in a 3 months period (except for Non-infected Controls) Exclusion Criteria: 1. Teenagers not consenting to treatment will be invited to continue as non-treated controls. 2. Known allergy to any of the antimicrobials used in the trial protocol (except for Non-infected Controls) 3. Signs/symptoms compatible with organic abdominal pain according to Rome IV criteria: persistent right upper or right lower quadrant pain, dysphagia, odynophagia, persistent vomiting, gastrointestinal blood loss, involuntary weight loss, deceleration of linear growth, delayed puberty. 4. Prior eradication therapy 5. Antimicrobial course received during the previous month (at least 3 days of treatment at appropriate dosing, children meeting this criteria can be included at a later stage) 6. Pregnancy 7. Use of immunosuppressive or biologic drugs 8. Children deemed "not healthy" after review of the questionnaire by study physician

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Conditions

The condition(s) this trial relates to.

Helicobacter pylori infectious disease gastric cancer prevention target

As listed by the trial registrant

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

Helicobacter pylori infection

How to take part

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

  1. The places running it

    3 sites. 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

  • Universidad de Aysén

    RECRUITING

    Coyhaique, Chile

  • Universidad de Chile

    RECRUITING

    Santiago, Chile

  • Universidad de la Frontera

    RECRUITING

    Temuco, Chile

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