Clinical trial Recruiting at 6 sites Phase 3 Interventional Ages 65 and up Women only

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.

More Breast Cancer Female trials

Quick facts

PhasePhase 3
Study typeInterventional
Ages65 Years and up
SexWomen only
Enrollment354 (estimated)
SponsorUniversity of Virginia
Academic / other
Drugs / interventionschemotherapy, radiation
Locations6 sites (New Haven, Connecticut and 5 other locations)
StatusRecruiting
StartedJuly 19, 2024
Main results expectedJune 30, 2029
Study endsMarch 1, 2034
Registry record updatedJune 30, 2026
Trial IDNCT06507618 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

  • 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

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.