FES Imaging to Optimize Tamoxifen for Metastatic Breast Cancer
Public ClinicalTrials.gov record NCT04174352. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Official title
A Pilot Study of FES Imaging to Optimize Tamoxifen Dose for Metastatic Breast Cancer Patients With ESR1 Mutations
Brief summary
Reproduced verbatim from the official ClinicalTrials.gov record. Not medical advice.
Despite broad advancements in endocrine therapy for ERα+ breast cancer, resistance ultimately develops. A common driver of resistance are known ESR1 mutations that lead to constitutively active receptor signaling and transcriptional regulation that is always "turned on" despite the absence of estrogen. Patients with ESR1 mutations are expected to have decreased binding affinity for tamoxifen and thus may be underdosed on standard therapy. \[18F\]-fluoroestradiol Positron Emission Tomography/Computed tomography (FES-PET/CT) imaging is a novel functional imaging technique that can non-invasively measure ERα expression and inhibition in metastatic ERα+ breast cancer. The proposed a pilot study uses FES-PET/CT imaging to measure ERα blockade to determine the optimal dose of tamoxifen in patients with ESR1 mutations.
Study identification
- NCT ID
- NCT04174352
- Recruitment status
- Recruiting
- Study type
- Interventional
- Phase
- Early Phase 1
- Enrollment
- 12 participants
Conditions and interventions
Conditions
Eligibility (public fields only)
- Age range
- 19 Years and older
- Sex
- All
- Healthy volunteers
- Healthy volunteers not accepted
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Oct 19, 2020
- Primary completion
- Nov 30, 2026
- Completion
- Nov 30, 2027
- Last update posted
- Jul 20, 2026
2020 – 2027
United States locations
- U.S. sites
- 2
- U.S. states
- 1
- U.S. cities
- 1
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| University of Wisconsin Carbone Cancer Center | Madison | Wisconsin | 53792 | Recruiting |
| Wisconsin Oncology Network (WONIX) sites | Madison | Wisconsin | 53792 | Not yet recruiting |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT04174352, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted Jul 20, 2026 · Synced Sep 2, 2026
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Open the official record
The complete protocol, eligibility criteria, and contact information for NCT04174352 live on ClinicalTrials.gov.