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Pre-Operative Window of Adjuvant Endocrine Therapy to Inform RT Decisions in Older Women With Early-Stage Breast Cancer

Pre-Operative Window of Adjuvant Endocrine Therapy to Inform Radiation Therapy Decisions In Older Women With Early-Stage Breast Cancer

Status
Active, not recruiting
Phases
Phase 2
Study type
Interventional
Source
ClinicalTrials.gov
Registry ID
NCT04272801
Acronym
POWER
Enrollment
84
Registered
2020-02-17
Start date
2020-04-07
Completion date
2026-06-01
Last updated
2025-10-22

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Breast Cancer Female

Keywords

breast cancer, endocrine therapy, radiation, letrozole, anastrozole, exemestane, tamoxifen, survey, questionnaire, geriatric

Brief summary

This is a prospective multisite exploratory study for women ≥ 65 years of age with early stage estrogen receptor positive (ER+) breast cancer. These individuals will be treated with 3 months of pre-operative endocrine therapy (pre-ET) with assessment of tolerance to the endocrine therapy by patient reported outcome (PRO) measures (patient surveys).

Detailed description

This single arm pilot study evaluates the use of pre-operative endocrine therapy in women with early stage ER+ breast cancer who are 65 years or older and are scheduled to have breast conservation surgery (BCS). The purpose of this study is to see if tolerance of pre-operative endocrine therapy helps inform decisions on whether or not to omit radiation. Participants will be treated with the novel approach of 3 months of pre-operative endocrine therapy, so that the participants and providers will have some indication of tolerance prior to making a decision about radiation omission. Tolerance of the endocrine therapy will be assessed by patient reported outcome (PRO) measures during neoadjuvant and adjuvant endocrine therapy treatment periods. Breast cancer participants and their surgical oncologists will be asked their preference regarding radiation therapy before starting endocrine therapy and again pre-operatively. They will make a determination regarding radiation therapy as per standard care. The hypothesis is that knowledge of tolerance of endocrine therapy will influence the decision by the patient and the surgical oncologist whether or not to elect radiation omission.

Interventions

choice and dose of neoadjuvant endocrine therapy at the discretion of the treating medical oncologist

BEHAVIORALPatient reported outcomes

Questionnaire inquiries include the following: * how cancer affects daily living * beliefs about medicines and sensitivity to medicine * symptoms * adherence to endocrine therapy * general health and well being * depression and anxiety * preference regarding radiation therapy

Sponsors

National Cancer Institute (NCI)
CollaboratorNIH
Shayna Showalter, MD
Lead SponsorOTHER

Study design

Allocation
NA
Intervention model
SINGLE_GROUP
Primary purpose
TREATMENT
Masking
NONE

Intervention model description

Pilot, 1 arm

Eligibility

Sex/Gender
FEMALE
Age
65 Years to No maximum
Healthy volunteers
No

Inclusion criteria

(Summary): * ECOG performance status 0-2 * Diagnosed with anatomic stage I, ER positive, PR positive or negative, and HER2 non amplified invasive breast cancer and clinically negative nodes; any invasive breast cancer histologic subtype may be enrolled * Tumor size ≤ 2 cm * Patient has elected BCS as surgical choice * Eligible to receive tamoxifen or an aromatase inhibitor * Ability to take oral medication and be willing to adhere to the endocrine therapy for the 3 month period prior to BCS

Exclusion criteria

(Summary): * Prior or current use of endocrine therapy for breast cancer * History of ipsilateral breast radiation * Pregnancy or lactation * Has a known additional malignancy that is progressing or requires active treatment. Exceptions include basal cell carcinoma of the skin or squamous cell carcinoma of the skin that has undergone potentially curative therapy or in situ cervical cancer. * Current or planned use of a strong CYP2D6 inhibitor (e.g. Fluoxetine, Paroxetine) and is not able to receive an endocrine therapy agent that does not use the CYP2D6 pathway

Design outcomes

Primary

MeasureTime frameDescription
Number of Participants Who Changed Their Preference for Adjuvant Radiation Treatmentup to 6 monthsChange in participant response to question regarding preference for adjuvant radiation treatment
Change in Surgeon Preference for Adjuvant Radiation Treatmentup to 6 monthsChange in surgical oncologist response to question regarding preference for adjuvant radiation treatment

Secondary

MeasureTime frameDescription
Illness Perception as Predictive Measure for Endocrine Therapy Adherence and to Assess Effect of Pre-ET on Decision Outcomes for Adjuvant Therapy After BCSThrough 24 months after start of adjuvant treatment periodIllness perception will be assessed using the Brief Illness Perception Questionnaire.
Beliefs About Medicine as Predictive Measure for Endocrine Therapy Adherence and to Assess Effect of Pre-ET on Decision Outcomes for Adjuvant Therapy After BCSThrough 24 months after start of adjuvant treatment periodBeliefs about medicine will be assessed using the Beliefs about Medicines Questionnaire.
Perceived Sensitivity to Medicine as Predictive Measure for Endocrine Therapy Adherence and to Assess Effect of Pre-ET on Decision Outcomes for Adjuvant Therapy After BCSThrough 24 months after start of adjuvant treatment periodPerceived sensitivity to medicine will be assessed using the Perceived Sensitivity to Medicine Scale.
Health Related Quality of Life Surveys as Predictive Measure for Endocrine Therapy Adherence and to Assess Effect of Pre-ET on Decision Outcomes for Adjuvant Therapy After BCSThrough 24 months after start of adjuvant treatment periodHealth related quality of life will be assessed using the EORTC QLQ-C30 and QLQ-BR23.
Treatment Decision as Predictive Measure for Endocrine Therapy Adherence and to Assess Effect of Pre-ET on Decision Outcomes for Adjuvant Therapy After BCS.up to 90 days after surgery, chemotherapy completion, or RT completion, whichever is laterTreatment decision will be assessed using the Treatment Decision Survey, a novel series of questions regarding why subjects decide to have or not to have radiation therapy, and why or why not to restart endocrine therapy.
Perceptions Related to Medical Choices as Predictive Measure for Endocrine Therapy Adherence and to Assess Effect of Pre-ET on Decision Outcomes for Adjuvant Therapy After BCS.Through 24 months after start of adjuvant treatment periodSubjects' perceptions related to their medical choices will be assessed using the Decisional Conflict Scale and the Decision Regret Scale.
Depression and Anxiety as Predictive Measure for Endocrine Therapy AdherenceThrough 24 months after start of adjuvant treatment periodDepression and anxiety will be assessed using the Center for Epidemiologic Studies Depression Scale Revised.
Breast Cancer Beliefs as Predictive Measure for Endocrine Therapy Adherence and to Assess Effect of Pre-ET on Decision Outcomes for Adjuvant Therapy After BCSThrough 24 months after start of adjuvant treatment periodBreast cancer beliefs will be assessed using the UVA Breast Cancer Belief Survey, a novel series of questions regarding patient beliefs about breast cancer and breast cancer medications.
General Symptom Burden as Predictive Measure for Endocrine Therapy Adherence and to Assess Effect of Pre-ET on Decision Outcomes for Adjuvant Therapy After BCSThrough 24 months after start of adjuvant treatment periodGeneral symptom burden will be assessed using the Breast Cancer Prevention Trial Symptom Checklist.

Countries

United States

Participant flow

Participants by arm

ArmCount
Pre-operative endocrine therapy
All participants enrolled to the study will receive 3 months of pre-operative endocrine therapy (e.g. tamoxifen or aromatase inhibitors (AIs) such as letrozole, anastrozole, or exemestane). The choice and dose of endocrine therapy will be at the discretion of the treating medical oncologist. tamoxifen, letrozole, anastrozole, or exemestane: choice and dose of neoadjuvant endocrine therapy at the discretion of the treating medical oncologist Patient reported outcomes: Questionnaire inquiries include the following: * how cancer affects daily living * beliefs about medicines and sensitivity to medicine * symptoms * adherence to endocrine therapy * general health and well being * depression and anxiety * preference regarding radiation therapy
75
Total75

Withdrawals & dropouts

PeriodReasonFG000
Overall StudyIneligible1
Overall StudyLost to Follow-up4
Overall StudyWithdrawal by Subject4

Baseline characteristics

CharacteristicPre-operative endocrine therapy
Age, Categorical
<=18 years
0 Participants
Age, Categorical
>=65 years
75 Participants
Age, Categorical
Between 18 and 65 years
0 Participants
Age, Continuous78.5 years
Ethnicity (NIH/OMB)
Hispanic or Latino
1 Participants
Ethnicity (NIH/OMB)
Not Hispanic or Latino
74 Participants
Ethnicity (NIH/OMB)
Unknown or Not Reported
0 Participants
Race (NIH/OMB)
American Indian or Alaska Native
0 Participants
Race (NIH/OMB)
Asian
0 Participants
Race (NIH/OMB)
Black or African American
7 Participants
Race (NIH/OMB)
More than one race
0 Participants
Race (NIH/OMB)
Native Hawaiian or Other Pacific Islander
0 Participants
Race (NIH/OMB)
Unknown or Not Reported
0 Participants
Race (NIH/OMB)
White
68 Participants
Region of Enrollment
United States
75 Participants
Sex: Female, Male
Female
75 Participants
Sex: Female, Male
Male
0 Participants

Adverse events

Event typeEG000
affected / at risk
deaths
Total, all-cause mortality
0 / 75
other
Total, other adverse events
35 / 75
serious
Total, serious adverse events
2 / 75

Outcome results

Primary

Change in Surgeon Preference for Adjuvant Radiation Treatment

Change in surgical oncologist response to question regarding preference for adjuvant radiation treatment

Time frame: up to 6 months

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Pre-operative endocrine therapyChange in Surgeon Preference for Adjuvant Radiation Treatment18 Participants
Primary

Number of Participants Who Changed Their Preference for Adjuvant Radiation Treatment

Change in participant response to question regarding preference for adjuvant radiation treatment

Time frame: up to 6 months

ArmMeasureValue (COUNT_OF_PARTICIPANTS)
Pre-operative endocrine therapyNumber of Participants Who Changed Their Preference for Adjuvant Radiation Treatment21 Participants
Secondary

Beliefs About Medicine as Predictive Measure for Endocrine Therapy Adherence and to Assess Effect of Pre-ET on Decision Outcomes for Adjuvant Therapy After BCS

Beliefs about medicine will be assessed using the Beliefs about Medicines Questionnaire.

Time frame: Through 24 months after start of adjuvant treatment period

Secondary

Breast Cancer Beliefs as Predictive Measure for Endocrine Therapy Adherence and to Assess Effect of Pre-ET on Decision Outcomes for Adjuvant Therapy After BCS

Breast cancer beliefs will be assessed using the UVA Breast Cancer Belief Survey, a novel series of questions regarding patient beliefs about breast cancer and breast cancer medications.

Time frame: Through 24 months after start of adjuvant treatment period

Secondary

Depression and Anxiety as Predictive Measure for Endocrine Therapy Adherence

Depression and anxiety will be assessed using the Center for Epidemiologic Studies Depression Scale Revised.

Time frame: Through 24 months after start of adjuvant treatment period

Secondary

General Symptom Burden as Predictive Measure for Endocrine Therapy Adherence and to Assess Effect of Pre-ET on Decision Outcomes for Adjuvant Therapy After BCS

General symptom burden will be assessed using the Breast Cancer Prevention Trial Symptom Checklist.

Time frame: Through 24 months after start of adjuvant treatment period

Secondary

Health Related Quality of Life Surveys as Predictive Measure for Endocrine Therapy Adherence and to Assess Effect of Pre-ET on Decision Outcomes for Adjuvant Therapy After BCS

Health related quality of life will be assessed using the EORTC QLQ-C30 and QLQ-BR23.

Time frame: Through 24 months after start of adjuvant treatment period

Secondary

Illness Perception as Predictive Measure for Endocrine Therapy Adherence and to Assess Effect of Pre-ET on Decision Outcomes for Adjuvant Therapy After BCS

Illness perception will be assessed using the Brief Illness Perception Questionnaire.

Time frame: Through 24 months after start of adjuvant treatment period

Secondary

Perceived Sensitivity to Medicine as Predictive Measure for Endocrine Therapy Adherence and to Assess Effect of Pre-ET on Decision Outcomes for Adjuvant Therapy After BCS

Perceived sensitivity to medicine will be assessed using the Perceived Sensitivity to Medicine Scale.

Time frame: Through 24 months after start of adjuvant treatment period

Secondary

Perceptions Related to Medical Choices as Predictive Measure for Endocrine Therapy Adherence and to Assess Effect of Pre-ET on Decision Outcomes for Adjuvant Therapy After BCS.

Subjects' perceptions related to their medical choices will be assessed using the Decisional Conflict Scale and the Decision Regret Scale.

Time frame: Through 24 months after start of adjuvant treatment period

Secondary

Treatment Decision as Predictive Measure for Endocrine Therapy Adherence and to Assess Effect of Pre-ET on Decision Outcomes for Adjuvant Therapy After BCS.

Treatment decision will be assessed using the Treatment Decision Survey, a novel series of questions regarding why subjects decide to have or not to have radiation therapy, and why or why not to restart endocrine therapy.

Time frame: up to 90 days after surgery, chemotherapy completion, or RT completion, whichever is later

Source: ClinicalTrials.gov · Data processed: Feb 10, 2026