Pre-operative endocrine therapy for older women with early-stage breast cancer
Official title: A Randomized, Phase III Trial of Pre-Operative Window of Endocrine Therapy to Inform Radiation Therapy Decisions in Older Women With Early-Stage Breast Cancer (POWER II)
Run by University of Virginia · NCT06507618 · Data updated 2026-11-12
This study is testing if giving older women with early-stage breast cancer a 90-day treatment before surgery can help them tolerate the treatment better and decide if they need radiation afterwards.
Quick facts
| Phase | Phase 3 |
|---|---|
| Study type | Interventional |
| Ages | 65 Years and up |
| Sex | Women only |
| Enrollment | 354 (estimated) |
| Sponsor | University of Virginia Academic / other |
| Drugs / interventions | chemotherapy, radiation |
| Locations | 6 sites (New Haven, Connecticut and 5 other locations) |
| Status | Recruiting |
| Started | July 19, 2024 |
| Main results expected | June 30, 2029 |
| Study ends | March 1, 2034 |
| Registry record updated | June 30, 2026 |
| Trial ID | NCT06507618 on ClinicalTrials.gov |
Is this trial a fit for you?
✓Likely a good fit
Ideal candidates for this study are women aged 65 and older diagnosed with early-stage ER+ breast cancer who are eligible for breast-conserving surgery.
✕Probably not a fit
Patients with bilateral synchronous breast cancer or those who have previously received endocrine therapy may not benefit from this study.
A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.
What this trial studies
This Phase III, multisite exploratory study focuses on women aged 65 and older with early-stage estrogen receptor positive (ER+) breast cancer. Participants will be randomly assigned to either receive 90 days of pre-operative endocrine therapy or proceed directly to breast cancer surgery without prior treatment. The study aims to assess the tolerance and compliance to endocrine therapy through patient-reported outcomes. The goal is to determine if pre-operative therapy can inform decisions regarding the necessity of radiation therapy post-surgery.
Why it matters
Potential benefit: If successful, this approach could help reduce unnecessary radiation therapy in older women with breast cancer, leading to better treatment outcomes and quality of life.
How similar studies have gone: Previous studies, such as the POWER I trial, have shown success in using pre-operative endocrine therapy to influence treatment decisions, indicating a promising approach.
Who can join: the full rules
Show full inclusion / exclusion criteria
Inclusion Criteria (summary): * Diagnosis of ER+, PR +/-, and HER2- non amplified invasive breast cancer and clinically negative nodes * ECOG performance status 0-2 * Females, aged ≥ 65 years * Patient is eligible for BCS and opted for BCS * Patient is a candidate for radiation therapy * Patient is a candidate for endocrine therapy (tamoxifen or an aromatase inhibitor) * Ability to take oral medication and be willing to adhere to endocrine therapy for the 3-month period prior to BCS * Agreement to adhere to Lifestyle Considerations (details in protocol) throughout study duration * Provision of signed and dated informed consent form * Stated willingness to comply with all study procedures and availability for the duration of the study Exclusion Criteria: * Bilateral synchronous breast cancer * Multicentric disease * Prior use of Tamoxifen or aromatase inhibitors * History of ipsilateral breast radiation therapy * Has a known additional malignancy that is progressing and/or requires active treatment with cytotoxic chemotherapy or radiation therapy. Malignancies deemed stable and low risk for complication per investigator's judgment may be allowed after discussion with multi-site PI. * Current or planned use of a strong CYP2D6 inhibitor (e.g., Fluvoxamine, Paroxetine) and is not able to receive an endocrine therapy agent that does not use the CYP2D6 pathway.
Where it's running
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Yale University
New Haven, Connecticut, United States Recruiting -
University of Virginia
Charlottesville, Virginia, United States Recruiting -
University of Virginia Community Health
Culpeper, Virginia, United States Recruiting -
INOVA Schar Cancer
Fairfax, Virginia, United States Recruiting -
Riverside Health System
Newport News, Virginia, United States Recruiting -
Virginia Commonwealth University
Richmond, Virginia, United States Recruiting
Study contacts
- Principal investigator: Shayna L Showalter, MD — University of Virginia
- Study coordinator: Meagan Miller
- Email: aey8fc@uvahealth.org
- Phone: 434-243-8101
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How to take part
- Review the eligibility criteria above with your treating physician.
- Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
- Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.