Clinical Trial

STUDY02001740;22SCH740: Estradiol For ER+ Advanced Breast Cancer (ESTHER)

Study acronym: ESTHER
Recruiting Phase 2
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Summary
Determine whether subjects harboring ESR1-mutant/amplified breast cancer have a higher rate of clinical benefit from 17b-estradiol therapy than subjects with ESR1-wild-type breast cancer
Protocol Amendment History 6 amendments
This ClinicalTrials.gov record has been amended 6 times since 2023-01-28; most recent amendment 2026-04-30.
Status change: Not Yet Recruiting → Recruiting 2023-07-17
Trial Details
NCT Number NCT05716516
Lead Sponsor Dartmouth-Hitchcock Medical Center
Conditions Metastatic Breast Cancer
Enrollment 36 participants
Start Date 2023-05-04
Primary Completion 2027-05 (estimated)
Study Completion 2027-05 (estimated)
Updated on ClinicalTrials.gov 2026-05-05