NCT07340541

Brief Summary

This is a multicenter, multi-arm, biomarker-stratified trial designed to evaluate biomarker-directed therapies in patients with estrogen receptor-positive/hormone receptor-negative (ER+/HR-) and triple-negative (TN) metastatic breast cancer (MBC). The trial integrates both retrospective and prospective data collection, including archival tumor tissue, medical record abstraction, and prospective tumor and blood sampling prior to initiation of protocol directed treatment. Based on biomarker subtype, participants will receive standard of care therapy. Liquid biopsy will be collected on Cycle 2 Day 1, and then liquid biopsy, imaging and clinical data will be collected at each re-staging. Treatment will continue until discontinuation for progression, toxicity or at the discretion of the treating physician.

Trial Health

77
On Track

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Enrollment
700

participants targeted

Target at P75+ for phase_2 breast-cancer

Timeline
60mo left

Started Feb 2026

Typical duration for phase_2 breast-cancer

Geographic Reach
1 country

2 active sites

Status
recruiting

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

Click on a node to explore related trials.

Study Timeline

Key milestones and dates

Study Progress6%
Feb 2026Jun 2031

First Submitted

Initial submission to the registry

January 12, 2026

Completed
2 days until next milestone

First Posted

Study publicly available on registry

January 14, 2026

Completed
1 month until next milestone

Study Start

First participant enrolled

February 16, 2026

Completed
5.3 years until next milestone

Primary Completion

Last participant's last visit for primary outcome

June 2, 2031

Expected
Same day until next milestone

Study Completion

Last participant's last visit for all outcomes

June 2, 2031

Last Updated

May 20, 2026

Status Verified

May 1, 2026

Enrollment Period

5.3 years

First QC Date

January 12, 2026

Last Update Submit

May 19, 2026

Conditions

Keywords

biomarker directed therapiesbiomarker stratified trial

Outcome Measures

Primary Outcomes (1)

  • Intra-Individual Progression-Free Survival (PFS)

    Progression-Free Survival (PFS) is defined as the time from initiation of study therapy until documented disease progression per Response Evaluation Criteria In Solid Tumors Criteria (RECIST) v1.1 or death from any cause, whichever occurs first. For intra-individual comparisons across successive therapy lines, a PFS ratio will be calculated by dividing the PFS of the current line (nth line, PFSₙ) by the PFS of the preceding line ((n-1)th line, PFSn-1). This allows each patient to serve as their own control, reducing between-patient variability and normalizing for the expected decline in PFS with later lines. RECIST v1.1 defines Complete Response (CR) as disappearance of all target lesions, Partial Response (PR) as ≥30% decrease, Stable Disease (SD) as insufficient change for PR or PD, and Progressive Disease (PD) as ≥20% increase, measurable growth in non-target lesions, or new lesions.

    Up to 5 years

Secondary Outcomes (12)

  • Progression free survival (PFS) - Between-Arm Evaluation

    Up to 3 months

  • Tissue- and blood-based biomarkers on response rate

    Up to 3 months

  • Overall survival (OS)

    Up to 12 months

  • Objective response rate (ORR)

    Up to 3 months

  • Duration of response (DoR)

    Up to 12 months

  • +7 more secondary outcomes

Study Arms (6)

Cohort 1 Arm A

EXPERIMENTAL

ER+ (Estrogen Receptor Positive) and HER2- (Human Epidermal Growth Factor Receptor 2 Negative). ESR1 mutant positive or negative and Phosphatidylinositol 3-kinase catalytic subunit alpha / AKT serine/threonine kinase / PTEN loss or deletion negative.

Drug: SERD* + abemaciclib

Cohort 1- Arm B

EXPERIMENTAL

ER+ (Estrogen Receptor Positive) and HER2- (Human Epidermal Growth Factor Receptor 2 Negative). ESR1 mutant positive or negative and Phosphatidylinositol 3-kinase catalytic subunit alpha / AKT serine/threonine kinase / PTEN loss or deletion negative.

Drug: SERD* + everolimus

Cohort 2 Arm A

EXPERIMENTAL

ER+ (Estrogen Receptor Positive) and HER2- (Human Epidermal Growth Factor Receptor 2 Negative). ESR1 mutant negative or positive, and Phosphatidylinositol 3-kinase catalytic subunit alpha / AKT serine/threonine kinase / PTEN loss or deletion positive.

Drug: SERD* + abemaciclib

Cohort 2 Arm B

EXPERIMENTAL

ER+ (Estrogen Receptor Positive) and HER2- (Human Epidermal Growth Factor Receptor 2 Negative). ESR1 mutant negative or positive, and Phosphatidylinositol 3-kinase catalytic subunit alpha / AKT serine/threonine kinase / PTEN loss or deletion positive.

Drug: SERD* + everolimus or capecitabine

Cohort 3

ACTIVE COMPARATOR

Triple-Negative Breast Cancer (TNBC): ER- (Estrogen receptor negative), PR- (Progesterone receptor negative), HER2- HER2 negative. AR - = Androgen Receptor negative, PD-L1 (Programmed Death-Ligand 1) positive or negative.

Drug: SOC

Cohort 4

EXPERIMENTAL

Triple-Negative Breast Cancer (TNBC): ER- (Estrogen receptor negative), PR- (Progesterone receptor negative), HER2- HER2 negative. AR + = Androgen Receptor positive, PD-L1 (Programmed Death-Ligand 1) positive or negative.

Drug: Antiandrogen

Interventions

Investigators choice Selective Estrogen Receptor Degrader + abemaciclib therapy.

Cohort 1 Arm ACohort 2 Arm A

Investigators choice Selective Estrogen Receptor Degrader + everolimus therapy.

Cohort 1- Arm B
SOCDRUG

standard-of-care (SOC) chemotherapy in breast cancer

Cohort 3

Investigators choice Selective Estrogen Receptor Degrader + everolimus or capecitabine therapy.

Cohort 2 Arm B

Antiandrogen therapy

Cohort 4

Eligibility Criteria

Age18 Years+
Sexall
Healthy VolunteersNo
Age GroupsAdult (18-64), Older Adult (65+)

You may qualify if:

  • Written informed consent obtained to participate in the study and HIPAA authorization for release of personal health information.
  • Subject is willing and able to comply with study procedures based on the judgement of the investigator.
  • Age ≥ 18 years of age at the time of consent
  • ECOG Performance Status of 0-2 (see APPENDIX A: ECOG Performance Status Scale).
  • Patients must fulfill all eligibility criteria outlined in the LCCC2521 Parent Protocol and consented to LCCC2521 Parent Protocol

You may not qualify if:

  • Inaccessible metastatic lesion to research biopsy
  • Subject has already initiated 2nd line therapy
  • Concurrent disease or condition that in the opinion of the treating oncologist renders the patient inappropriate for study participation

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Study Sites (2)

Mayo Clinic

Rochester, Minnesota, 55905, United States

NOT YET RECRUITING

Lineberger Comprehensive Cancer Center at University of North Carolina - Chapel Hill

Chapel Hill, North Carolina, 27599-7305, United States

RECRUITING

Related Links

MeSH Terms

Conditions

Breast NeoplasmsTriple Negative Breast Neoplasms

Interventions

abemaciclibEverolimusCapecitabineAndrogen Antagonists

Condition Hierarchy (Ancestors)

Neoplasms by SiteNeoplasmsBreast DiseasesSkin DiseasesSkin and Connective Tissue Diseases

Intervention Hierarchy (Ancestors)

SirolimusMacrolidesLactonesOrganic ChemicalsDeoxycytidineCytidinePyrimidine NucleosidesPyrimidinesHeterocyclic Compounds, 1-RingHeterocyclic CompoundsFluorouracilUracilPyrimidinonesDeoxyribonucleosidesNucleosidesNucleic Acids, Nucleotides, and NucleosidesHormone AntagonistsHormones, Hormone Substitutes, and Hormone AntagonistsPhysiological Effects of DrugsPharmacologic ActionsChemical Actions and Uses

Study Officials

  • Lisa A Carey, MD

    UNC Lineberger Comprehensive Cancer Center

    PRINCIPAL INVESTIGATOR
  • Eric Winer, MD

    Yale University

    STUDY CHAIR

Central Study Contacts

Emily L Schworer

CONTACT

Ana Gallegos

CONTACT

Study Design

Study Type
interventional
Phase
phase 2
Allocation
NON RANDOMIZED
Masking
NONE
Purpose
TREATMENT
Intervention Model
PARALLEL
Model Details: Patients are stratified according to tumor marker profiles and receive corresponding treatment regimens.
Sponsor Type
OTHER
Responsible Party
SPONSOR

Study Record Dates

First Submitted

January 12, 2026

First Posted

January 14, 2026

Study Start

February 16, 2026

Primary Completion (Estimated)

June 2, 2031

Study Completion (Estimated)

June 2, 2031

Last Updated

May 20, 2026

Record last verified: 2026-05

Data Sharing

IPD Sharing
Will not share

Locations