Can an extra radiation dose keep HER2+ breast cancer at bay?
NCT ID NCT05893966
First seen Aug 10, 2026 · Last updated Aug 11, 2026 · Updated 1 time
Summary
This study looks at whether adding a tumor bed boost to standard whole breast radiation after breast-conserving surgery helps women with HER2-positive breast cancer. It will track recurrence, survival, and side effects over seven years. The goal is to see if the extra radiation dose improves long-term outcomes.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- Radiation therapy (whole breast irradiation with or without tumor bed boost)
- What this could lead to
- If successful, this could refine radiation treatment for HER2+ breast cancer, potentially reducing recurrence while minimizing side effects.
- What could go wrong
- This is an observational study, not a randomized trial, so results may be influenced by other factors. Radiation can cause side effects like skin irritation or fatigue.
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
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About 400 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Nov 2022
- Expected to finish
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Nov 2032
An estimate. End dates often move.
- Lead sponsor
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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
Any HER2+ invasive breast cancer patient with eligible performance except previous history of radiation therapy to ipsilateral breast
- Ages
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19 years and older
- Sex
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Female participants only
- Healthy volunteers
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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 Hide 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: * Female patients with age minimum 19 * Pathological confirmation of HER2+ invasive breast cancer * Eastern Cooperative Oncology Group performance status 0-2 * Informed consent of the participant Exclusion Criteria: * Pathological confirmation of ductal carcinoma in situ of the breast * Previous history of radiation therapy to ipsilateral breast
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
1 site. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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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
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Samsung Medical Center
RECRUITINGSeoul, Seoul, 06351, South Korea
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