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Promising breast cancer drug trial pulled before starting

NCT ID NCT06585969

Disease control Sponsor: Danish Breast Cancer Cooperative Group 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
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 Results may not be published yet.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 This study
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This status has not been confirmed recently, so it may be out of date.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 aimed to see if the drug trastuzumab deruxtecan worked better than standard CDK4/6 inhibitors for people with a specific advanced breast cancer (ER-positive, HER2-low, non-luminal A). It was designed for adults with metastatic disease. However, the trial was withdrawn before enrolling any participants, so no results are available.

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 3

Large-scale testing in a bigger group. Usually the last step before a treatment can be approved.

Started

Jan 2026

Finished

Jan 2026

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

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: * Women aged 18 or above. * Radiologically/pathologically verified metastatic breast cancer. * ER-positive (1% or more) and HER2-low (HER2 1+ or HER2 2+/ISH-neg)10,11. * PAM50 Luminal B, HER2-enriched or Basal-like. * Performance status 0-1. * Evaluable disease Exclusion Criteria: * Patients who are incapable of understanding the written material received * Patients with inaccessible tumour tissue * Other malignant disease within 5 years (in situ cervix and non-melanoma skin cancer excluded)

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Conditions

The condition(s) this trial relates to.

basal-like breast carcinoma breast cancer breast carcinoma breast neoplasm estrogen-receptor positive breast cancer luminal B breast carcinoma

As listed by the trial registrant

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

Basal like ER-positive breast cancer HER2 enriched Luminal B Metastatic breast cancer

More trials for these conditions

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