A Study of Surgery and Radiotherapy in People With Breast Cancer
A Randomized Phase II Study of Consolidative Surgery and Radiotherapy With Curative Intent for De Novo Oligometastatic HER2+ Breast Cancer [Ablation and Resection for the Consolidation of Oligometastatic HER2+ Breast Cancer (ARCHER)]
Memorial Sloan Kettering Cancer Center
162 participants
Sep 17, 2025
INTERVENTIONAL
Conditions
Summary
The researchers are doing this study to see if the combination of surgery, locoregional radiation therapy, SBRT (stereotactic body radiation therapy), and the usual approach is more effective in treating oligometastatic HER2-positive breast cancer than the usual approach alone. The researchers will also study the side effects of the study treatment.
Eligibility
Inclusion Criteria7
- Age ≥ 18 years.
- Pathologically-confirmed metastatic breast cancer.
- Oligometastatic breast cancer (≤5 discrete metastatic lesions) without CNS involvement; as seen on standard imaging during initial workup and monitoring prior to registration.
- HER2-positive breast cancer per CAP/ASCO guidelines as determined by staff pathologist (any estrogen or progesterone receptor status).
- Based on size and location, all metastatic sites can be safely treated with either SBRT or resection.
- Enrolled at least 3 months (and up to 12 months) after initiation of first-line systemic therapy AND without evidence of progression as determined by treating clinician (whether clinically or radiographically) during this window. (ie. in the judgement of the treating clinician, based on standard evaluations, all known disease must be controlled prior to enrollment).
- ECOG performance status 0-2; KPS 60-100
Exclusion Criteria7
- Any foci of disease progression during initial 3-12 months of first-line systemic therapy (as determined by treating clinician)
- Escalation of systemic therapy line due to progressive disease (i.e. initiated second-line therapy prior to enrollment).
- Comorbidities precluding receipt of radiotherapy, surgery or standard systemic therapy.
- Intracranial or intrathecal/intramedullary spinal disease (ie. CNS involvement is excluded from the study; epidural/vertebral disease is permitted)
- Prior cancer history requiring chemotherapy within the past 10 years (ie. prior cancers are permitted provided no chemotherapy was administered).
- Inclusion of Underrepresented Populations
- Individuals of all races and ethnic groups are eligible for this trial. There is no bias towards age or race in the clinical trial outlined. This trial is open to the accrual of men and women.
Interventions
Resection of the primary breast tumor (ie. lumpectomy when possible or mastectomy when breast conservation not possible). Surgical resection of the primary breast tumor is to be performed per standard guidelines as applied to localized disease. Breast conserving surgery (ie. lumpectomy) is allowable per patient preference when supported by standard surgical practice. Mastectomy is preferred when breast conservation is declined by the patient, or if breast conservation would otherwise not be feasible in the early-stage setting (e.g. large tumor:breast volume ratio, inability to achieve negative margins with breast conservation, etc)
Radiotherapy will be delivered using external beam radiation per the guidelines.Radiotherapy will be delivered using external beam radiation per the guidelines set forth below, targeting two main compartments: 1. Patients will undergo radiotherapy to the breast/chest wall, and regional nodal basins (including the axilla, supraclavicular fossa and internal mammary chain) per the standard adjuvant approach for locally advanced disease, and 2. Patient will undergo stereotactic body radiotherapy (SBRT) or similarly-ablative approaches to sites of distant disease, including all observable foci and those that may have since resolved radiographically during systemic therapy
Continue to receive the standard treatment you have already started, which includes trastuzumab, pertuzumab, paclitaxel, or a combination of these drugs. This treatment is not part of the study and will be decided by your regular treating physician.
Locations(7)
View Full Details on ClinicalTrials.gov
For the most up-to-date information, visit the official listing.
NCT07053085