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Study hints at less surgery for certain breast cancers

NCT ID NCT07211451

Knowledge-focused Sponsor: Gangnam Severance Hospital 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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This completed study looked at over 1,500 women with early-stage HER2-positive or triple-negative breast cancer who had no signs of cancer in their lymph nodes on ultrasound. All had breast-conserving surgery with lymph node removal. The goal was to see how often cancer actually spread to the nodes, and whether some patients could safely skip the lymph node biopsy in the future. The findings could lead to less invasive surgery for selected patients.

What this could mean

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

What this could lead to
If successful, this could help some breast cancer patients avoid unnecessary lymph node surgery, reducing side effects like arm swelling.
What could go wrong
This is an observational analysis of past data, not a clinical trial testing a new treatment. The findings need confirmation in future studies before changing practice.

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.

Participants

1,571 people

The number who actually took part.

Started

Jun 2025

Finished

Sep 2025

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.

Who is studied

Patients with early-stage HER2-positive breast cancer or TNBC who had clinically node-negative status on preoperative ultrasonography and underwent upfront breast-conserving surgery (BCS) with axillary surgery

Ages

19 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: * HER2-positive breast cancer or TNBC * Patients who received upfront breast conserving surgery with axillary surgery * Patients who had a clinically axillary node negative disease Exclusion Criteria: * Patients who underwent mastectomy * Absence of axillary nodal assessment on ultrasonography * Patients who underwent mastectomy * Patients who underwent mastectomy

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Conditions

The condition(s) this trial relates to.

breast cancer breast neoplasm HER2 positive breast carcinoma triple-negative breast carcinoma

As listed by the trial registrant

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

Breast cancer

Contacts and locations

Locations

  • Gangnam Severance Hospital, Yonsei University College of Medicine

    Seoul, Please Select, 06273, South Korea

More trials for these conditions

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