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Scientists hunt for clues to drug resistance in advanced breast cancer

NCT ID NCT04653740

Knowledge-focused Sponsor: Centre Oscar Lambret 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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Sep 18, 2026 · Updated 2 times

Summary

This study follows 25 women with advanced breast cancer to understand why the drug palbociclib stops working over time. Researchers collect blood and tumor samples before and after the cancer progresses to look for genetic and chemical changes. The goal is not to treat the disease directly, but to gather knowledge that could improve future treatments.

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 25 people

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

Started

Sep 2020

Expected to finish

Nov 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

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 over 18 years old * With histologically proven breast cancer, positives hormones receptors and negative HER2 * Advanced disease (metastases or non-resequable locoregional disease), from the 1st to the 4th line. * With an indication for hormone therapy associated with the CDK4/6 inhibitor Palbociclib * Agree to the sampling of the study * Signed the informed consent form Exclusion Criteria: * Neoadjuvant or adjuvant treatment for localized breast cancer * Metastatic breast cancer beyond the forth line * Impossibility to give informed consent (person deprived of liberty or under guardianship)

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Conditions

The condition(s) this trial relates to.

breast cancer breast carcinoma breast neoplasm hormone receptor-positive breast cancer

As listed by the trial registrant

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

Advanced breast cancer

Contacts and locations

Locations

  • Centre Oscar Lambret

    Lille, France, 59020, France

More trials for these conditions

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