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Elacestrant

Phase 3

ER-positive Breast Cancer | Small molecule | Oncology |Natera, Inc.|Last Updated: Aug 10, 2026

Target and mechanism

Molecular targetESR1
Target classDegrader
ModalitySmall molecule

Success Probability

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Market & Valuation

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Trial Design

RandomizedACTIVE_CONTROLLEDDMC
Total Trials1
Total Enrollment220

FDA Designations

No designations recorded

Clinical trial landscape

Elacestrant · 1 trial · 4 indications

Phase 3 1
NCT05512364Elacestrant for Treating ER+/HER2- Breast Cancer Patients With ctDNA Relapse (TREAT ctDNA)ER-positive Breast Cancer
RECRUITING220 Analytics
PHASE3RECRUITING
Elacestrant for Treating ER+/HER2- Breast Cancer Patients With ctDNA Relapse (TREAT ctDNA)
ER-positive Breast CancerUnlock trial analytics

Study Endpoints

Primary Endpoints

Distant metastasis free survival (DMFS)
Final DFMS will be 6.25 years after the first patient randomised.

Distant metastasis free survival (DMFS) defined as the time from randomisation until first distant metastatic recurrence or death from any cause, whichever occurs first

Secondary Endpoints

Invasive disease-free survival (iDFS)
Through study completion, up to 11.7 years
Relapse-free survival (RFS)
Through study completion, up to 11.7 years
Overall survival rate
Through study completion, up to 11.7 years
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Study Design & Arms

AllocationRANDOMIZED
MaskingNONE
ModelPARALLEL
PurposeTREATMENT

Treatment Arms

ArmTypeDescription
Experimental armEXPERIMENTALelacestrant 400 mg/day orally once daily on a continuous dosing schedule
Control armACTIVE_COMPARATORstandard endocrine treatment - the same they were receiving at the time of ctDNA detection

Interventions

NameTypeDescription
ElacestrantDRUG400mg QD orally on a continuous dosing schedule
TamoxifenDRUG20 mg QD orally on a continuous dosing schedule
Letrozole 2.5mgDRUG2.5 mg QD orally on a continuous dosing schedule
Anastrozole 1mgDRUG1 mg QD orally on a continuous dosing schedule
Exemestane 25 MGDRUG25 mg QD orally on a continuous dosing schedule
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Eligibility Criteria

Age Range18 Years to N/A
SexALL
Healthy VolunteersNo
Study Sites111

Inclusion Criteria: 1. ctDNA screening phase: Main inclusion criteria: • Female (both pre- and postmenopausal) or male patients with histologically confirmed ER positive (regardless of PR), HER2 negative breast cancer, according to local pathologist: * ER-positive defined as ≥ 10% of...

Countries:BelgiumCyprusFranceGermanyGreeceIrelandItalyNetherlandsPortugalSpainSwedenSwitzerland
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Recent Changes (Last 90 Days)

LOWAug 11, 2026NCT05512364lastUpdatePostDate: changed
LOWAug 11, 2026NCT05512364lastUpdatePostDate: changed
LOWAug 11, 2026NCT05512364lastUpdatePostDate: changed

Frequently asked questions about Elacestrant

What is Elacestrant used for in ER-positive Breast Cancer?

Elacestrant is an investigational small molecule being studied for the treatment of ER-positive, HER2-negative breast cancer, specifically in patients with ctDNA relapse. It is currently in Phase 3 clinical development for this indication.

What does Elacestrant target?

Elacestrant is a selective estrogen receptor degrader (SERD), a class of drugs that target the estrogen receptor. It is being studied in ER-positive breast cancer, where it aims to degrade the estrogen receptor to inhibit cancer cell growth.

Who makes Elacestrant?

Elacestrant is being developed by Natera, Inc. (NASDAQ: NTRA). The company is conducting a Phase 3 clinical trial of Elacestrant in patients with ER-positive, HER2-negative breast cancer.

What phase is Elacestrant in?

Elacestrant is in Phase 3 clinical development. It is an investigational drug and has not been approved by the FDA. The ongoing Phase 3 trial is actively recruiting patients with ER-positive, HER2-negative breast cancer.

What clinical trials is Elacestrant in?

Elacestrant is being evaluated in the Phase 3 TREAT ctDNA trial (NCT05512364), which is recruiting 220 patients with ER-positive, HER2-negative breast cancer who have ctDNA relapse. The trial is active-controlled and enrolling participants across multiple European countries.