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Radioactive bullet targets Hard-to-Treat breast cancer

NCT ID NCT07081555

Disease control Sponsor: Affibody 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 early-stage trial is testing a new drug called [177Lu]Lu-ABY-271, which delivers a small dose of radiation directly to HER2-positive breast cancer cells. The study will enroll 21 people with advanced or metastatic HER2-positive breast cancer to see if the drug is safe, tolerable, and where it goes in the body. It is a first-in-human study, so the main goals are to check for side effects and find the right dose.

What this could mean

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

Active substance
a radioactive drug called [177Lu]Lu-ABY-271 that targets HER2-positive cancer cells
What this could lead to
If it works, this could provide a new targeted treatment option for people with HER2-positive metastatic breast cancer that has stopped responding to other therapies.
What could go wrong
This is a very early (Phase 1) trial with only 21 people, so it is primarily testing safety and dosing. The drug may not shrink tumors or may cause side effects from radiation exposure.

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

About 21 people

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

Expected to start

Oct 2025

An estimate. Start dates often move.

Expected to finish

Jun 2028

An estimate. End dates often move.

Lead sponsor

A company

The lead sponsor is a pharmaceutical, biotech, or medical-device company.

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

Female 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: * Subject has unresectable locally advanced or metastatic breast cancer * Subject with histologically or cytologically confirmed carcinoma with documented HER2 overexpression (biopsy not older than 2 years): immunohistochemistry (IHC) score 3+; OR 2+ and fluorescence in situ hybridization (ISH) positive * At least one known tumor lesion ≥ 15 mm * Eastern Cooperative Oncology Group (ECOG) performance status ≤ 2 Part A only \- Subject is in treatment, or planned to start a new line of standard systemic anti-tumor therapy Part B only * Subject has progressive disease, documented radiologically in the last three months * Subject has received at least 3 lines of standard systemic anti-tumor therapy in the palliative setting * Subject has received last dose of previous line of systemic anti-tumor therapy, and has no ongoing treatment related toxicities \> grade 1 (except alopecia) prior to planned first dose of \[177Lu\]Lu-ABY-271 Exclusion Criteria: * Active brain metastases * Administration of another IMP within 5 half-lives (for experimental biologics: 6 months or 5 half-lives, whichever is longer) of the planned first dose of \[177Lu\]Lu-ABY-271 * Exposure to any anti-tumor therapy since the last documented progression, including any radiotherapy within 7 days prior to the planned first dose of \[177Lu\]Lu-ABY-271

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Conditions

The condition(s) this trial relates to.

breast cancer breast carcinoma breast neoplasm HER2 positive breast carcinoma

As listed by the trial registrant

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

HER2 + breast cancer Metastatic breast cancer

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

  • Akademiska Sjukhuset

    RECRUITING

    Uppsala, SE-751 85, Sweden

  • Karolinska University Hospital

    RECRUITING

    Stockholm, SE-17164, Sweden

  • Sahlgrenska University Hospital

    RECRUITING

    Gothenburg, S-413 45, Sweden

More trials for these conditions

Other studies related to the condition(s) this trial covers.