CI

At a glance

ClinicalIndex Comparison Record
Phase 3Completed· 478 enrolled
Drug / intervention
Elacestrant +1 moredrug
Likely dose
Elacestrant 400 mgfrom record
Structured eligibility isn't available for this trial yet — see the full criteria in the Eligibility tab below.

Standardized by ClinicalIndex from the ClinicalTrials.gov record · verify against the source.

Search/NCT03778931
NCT03778931Phase 3Completed

Elacestrant Monotherapy vs. Standard of Care for the Treatment of Patients With ER+/HER2- Advanced Breast Cancer Following CDK4/6 Inhibitor Therapy: A Phase 3 Randomized, Open-label, Active-controlled, Multicenter Trial

Stemline Therapeutics, Inc.·interventional·Posted Dec 19, 2018·Updated Sep 15, 2025

In Brief

A Phase 3 clinical trial evaluating Elacestrant and Standard of Care for Breast Cancer. Completed, enrolled 478 participants across 244 sites in 17 countries.

Detailed Summary

This Phase 3 clinical study compares the efficacy and safety of elacestrant to the standard of care (SoC) options of fulvestrant or an aromatase inhibitor (AI) in women and men with breast cancer whose disease has advanced on at least one endocrine therapy including a CDK4/6 inhibitor in combination with fulvestrant or an aromatase inhibitor (AI).

Study Details

Study Typeinterventional
Allocation--
Masking--
Primary Purpose--
ConditionsBreast Cancer
CountriesArgentina, Australia, Austria, Belgium, Canada, Denmark, France, Greece, Hungary, Ireland, Israel, Italy, Portugal, South Korea, Spain, United Kingdom, United States
Collaborators--

Timeline

Phase 3CompletedFinished
20192020202120222023202420252026
First PostedDec 19, 2018
Enrollment StartMay 10, 2019
Primary CompletionAug 24, 2021
Study CompletionAug 22, 2024
TodayJul 2, 2026
Enrollment to primary: 2.3 yearsPosted 7.5 years ago

Interventions

Elacestrantdrug

400 mg/day once daily oral dosing

Standard of Caredrug

* Fulvestrant: 500 mg administered intramuscularly (IM) into the buttocks as two 5 mL injections on C1D1, C1D15 and C2D1 and Day 1 of every subsequent 28-day cycle * Anastrozole 1 mg/day on a continuous dosing schedule * Letrozole: 2.5 mg/day on a continuous dosing schedule * Exemestane: 25 mg/day on a continuous dosing schedule