Overview
This phase II study evaluates SABR as non-operative treatment for women aged 65+ with ER-positive, HER2-negative breast cancer ≤5 cm and no lymph node involvement. Eligible patients, including those previously on endocrine therapy, receive 5 SABR treatments, followed by monitoring of quality of life and assessment of treatment-related toxicity.
Description
This is a prospective, phase II study of women with localized breast cancer receiving non-operative management with SABR delivered to the primary tumor. Patients will be screened that are age 65 and over with invasive breast cancer. Those eligible for the trial will have ER-positive and HER2-negative disease measuring ≤5 cm with negative clinical lymph nodes. Patients that were previously on primary ET, with either stable or progressive disease, will be eligible for this study if other inclusion criteria are met. Participants will receive SABR targeting the tumor consisting of 5 total treatments. Participants will then follow-up as per protocol with quality-of-life assessments and treatment-related toxicity evaluation.
Eligibility
Inclusion Criteria:
- Willing and able to provide written informed consent obtained to participate in the study and HIPAA authorization for release of personal health information.
- Women greater than or equal to age 65 years
- Diagnosis of invasive carcinoma of breast undergoing non-operative management
- Previously untreated OR previously treated with primary ET or chemotherapy, with either stable or progressive localized disease.
- Tumor measuring ≤5 cm (cT1-T2) and clinically node negative
- Diagnostic biopsy ER-positive (greater than or equal to 10% ER by immunohistochemistry staining)
- Diagnostic biopsy HER2-negative according to ASCO/CAP guidelines (0 or 1+ following IHC staining or proven negative by in-situ hybridization)
- Suitable for SABR as deemed by the treating radiation oncologist
- Participants with a prior or concurrent malignancy whose natural history or treatment does not have the potential to interfere with the safety or efficacy assessment of the investigational regimen are eligible for this trial
- Enrollment in another clinical trial is allowed if there would be no interference with interventions on this trial
Exclusion Criteria:
- Active treatment with systemic chemotherapy for breast cancer. Subjects will need to stop any breast cancer chemotherapy agent before enrollment to be included study.
- Multicentric tumor.
- Clinical or imaging evidence of distant metastases.
- Prior ipsilateral breast or thoracic radiation.
- Autoimmune conditions with associated radiation risks.
