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Cohort Study on Sequential ADC Therapy in HR-positive/HER2-negative Advanced Breast Cancer

NCT07162259 · Status: NOT_YET_RECRUITING · Phase: PHASE4 · Type: INTERVENTIONAL · Enrollment: 40

Last updated 2025-09-09

No results posted yet for this study

Summary

The combination of cyclin-dependent kinase 4/6 inhibitors (CDK4/6i) and endocrine therapy is the standard first-line treatment for advanced HR+ (hormone receptor-positive)/HER2- (human epidermal growth factor receptor 2-negative) breast cancer. However, the optimal treatment strategy after CDK4/6i progression remains unclear. In recent years, antibody-drug conjugates (ADCs) such as sacituzumab govitecan (SG) and trastuzumab deruxtecan (T-DXd) have demonstrated significant activity in HR+/HER2- breast cancer, providing new options post-CDK4/6i progression. Yet, the optimal sequencing of different ADCs (e.g., SG followed by T-DXd vs. T-DXd followed by SG) after CDK4/6i failure remains uncertain. Determining how to further optimize treatment selection to prolong survival and improve quality of life has become a key research focus in clinical practice. This study aims to explore the efficacy, safety, and potential resistance mechanisms of biomarker-guided sequential ADC therapy (e.g., SG→T-DXd vs. T-DXd→SG) following CDK4/6i progression. The findings may guide clinical decision-making and provide evidence for precision medicine.

Conditions

  • Breast Neoplasms

Interventions

DRUG

First-line T-DXd followed by SG upon disease progression

Patients will be assigned to Cohort 1 (HER2 IHC 2+) based on different HER2 immunohistochemical expression levels, where they will first receive T-DXd treatment, followed by SG treatment upon disease progression.

DRUG

First-line SG followed by T-DXd upon progression

Patients will be assigned to Cohort 2 (HER2 IHC ≤1+) based on different HER2 immunohistochemical expression levels, where they will first receive SG treatment, followed by T-DXd treatment upon disease progression.

Sponsors & Collaborators

  • Yan Xue

    lead OTHER

Principal Investigators

  • Yan Xue · Xi'an International Medical Center Hospital

Study Design

Allocation
NON_RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Model
PARALLEL

Eligibility

Min Age
18 Years
Max Age
85 Years
Sex
FEMALE
Healthy Volunteers
No

Timeline & Regulatory

Start
2025-10-01
Primary Completion
2027-12-31
Completion
2027-12-31
FDA Drug
Yes

Countries

  • China

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT07162259 on ClinicalTrials.gov