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Zapping a single tumor may keep breast cancer in check

NCT ID NCT05534438

Disease control Sponsor: Memorial Sloan Kettering Cancer Center 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jul 10, 2026 · Updated 1 time

Summary

This study tests whether giving a precise, high-dose radiation treatment called SBRT to one growing tumor can help people with metastatic breast cancer keep their disease under control. Participants continue their usual drug therapy while receiving SBRT to a single site where cancer has worsened. The goal is to see if this approach prevents cancer from spreading further or getting worse elsewhere.

What this could mean

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

Active substance
Stereotactic body radiation therapy (SBRT)
What this could lead to
If it works, this could help people with metastatic breast cancer delay further cancer spread and stay on their current treatment longer.
What could go wrong
This is a small, early-phase trial with only 46 participants, so results may not apply to everyone. SBRT can cause side effects like fatigue or pain at the treated site.

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 2

Tests whether the treatment actually works, and watches for side effects, in a larger group.

Participants

About 46 people

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

Started

Sep 2022

Expected to finish

Sep 2026

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

18 years and older

Sex

Anyone

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: * Age 18 or older * Willing and able to provide informed consent * Metastatic breast cancer, biopsy proven * ER+/HER2-, defined as \>5% ER+ staining * HER2+ (regardless of ER status), including HER2-low and high expressors * History of at least 6 months, sustained response to systemic therapy (clinically or radiographically defined as complete or stable response without progression) * Isolated site of disease progression on FDG PET scan * Consented to 12-245 * ECOG performance status 0-1 Exclusion Criteria: * Pregnancy * Serious medical comorbidity precluding radiation, including connective tissue disorders * Intracranial disease (including previous intracranial involvement) * Previous radiotherapy to the intended treatment site that precludes developing a treatment plan that respects normal tissue tolerances.

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Conditions

The condition(s) this trial relates to.

breast cancer breast carcinoma breast neoplasm estrogen-receptor positive breast cancer HER2 positive breast carcinoma

As listed by the trial registrant

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

Breast cancer ER+ breast cancer HER2 + breast cancer Metastatic breast cancer Metastatic breast carcinoma Oligometastatic breast carcinoma

How to take part

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

  1. The places running it

    8 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

  • Lehigh Valley Health Network (Data Collection Only)

    NOT_YET_RECRUITING

    Allentown, Pennsylvania, 18103, United States

  • Memorial Sloan Kettering Basking Ridge (Limited Protocol Activities)

    RECRUITING

    Basking Ridge, New Jersey, 10065, United States

  • Memorial Sloan Kettering Bergen (Limited Protocol Activities)

    RECRUITING

    Montvale, New Jersey, 07645, United States

  • Memorial Sloan Kettering Cancer Center (All Protocol Activities)

    RECRUITING

    New York, New York, 10065, United States

  • Memorial Sloan Kettering Commack (Limited Protocol Activities)

    RECRUITING

    Commack, New York, 11725, United States

  • Memorial Sloan Kettering Monmouth (Limited Protocol Activities)

    RECRUITING

    Middletown, New Jersey, 07748, United States

  • Memorial Sloan Kettering Nassau (Limited Protocol Activities)

    RECRUITING

    Uniondale, New York, 11553, United States

  • Memorial Sloan Kettering Westchester (Limited Protocol Activities)

    RECRUITING

    Harrison, New York, 10604, United States

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