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Disitamab Vedotin Plus Bevacizumab in HER2-Low Metastatic Breast Cancer After T-DXd Failure: A Phase II Study

NCT07446452 · Status: RECRUITING · Phase: PHASE2 · Type: INTERVENTIONAL · Enrollment: 37

Last updated 2026-03-03

No results posted yet for this study

Summary

This is a multicenter, single-arm, phase II clinical trial designed to evaluate the efficacy and safety of disitamab vedotin in combination with bevacizumab in patients with HER2-low advanced or metastatic breast cancer who have experienced disease progression following prior T-DXd therapy. Eligible patients must have HER2-low expression (IHC 1+ or 2+/FISH-) and have previously received T-DXd. Participants will receive RC48 (disitamab vedotin) plus bevacizumab according to the study protocol.

Treatment-related adverse events will be closely monitored and managed, with severity graded according to CTCAE v5.0 criteria. Supportive care or dose adjustments will be implemented as necessary. The primary endpoint is objective response rate (ORR). Secondary endpoints include progression-free survival (PFS), overall survival (OS), disease control rate (DCR), and duration of response (DOR), all of which will be evaluated by an independent review committee. Safety assessments will include the incidence, severity, management, and outcomes of adverse events. Patient-reported quality of life will be evaluated using the EORTC QLQ-C30 questionnaire at predefined intervals.

In addition, this study will conduct exploratory multi-omics translational research to investigate the potential molecular mechanisms underlying treatment response and resistance, and to identify predictive biomarkers associated with clinical outcomes. The ultimate goal is to assess the therapeutic efficacy and safety of this regimen, and to develop predictive models that may help identify HER2-low patients most likely to benefit, thereby supporting precision and individualized treatment strategies.

Conditions

  • HER2-low Breast Cancer

Interventions

DRUG

Disitamab Vedotin (RC48)

A HER2-targeted antibody-drug conjugate comprising a humanized anti-HER2 monoclonal antibody linked via a cathepsin-cleavable MC-VC-PAB linker to the microtubule inhibitor MMAE (drug-to-antibody ratio ≈4). Administered intravenously at 2.0 mg/kg every 2 weeks.

DRUG

Bevacizumab

A recombinant humanized monoclonal antibody that binds vascular endothelial growth factor (VEGF) to inhibit tumor angiogenesis. Administered intravenously at 5 mg/kg every 2 weeks in combination with RC48.

Sponsors & Collaborators

  • RenJi Hospital

    collaborator OTHER

  • Anhui Provincial Hospital

    collaborator OTHER_GOV

  • The Affiliated Hospital of Xuzhou Medical University

    collaborator OTHER

  • The First Hospital of Jilin University

    collaborator OTHER

  • Shanghai Minhang Central Hospital

    collaborator OTHER

  • Zhejiang Cancer Hospital

    collaborator OTHER

  • Huai'an First People's Hospital

    collaborator OTHER

  • The First Affiliated Hospital with Nanjing Medical University

    lead OTHER

Study Design

Allocation
NA
Purpose
TREATMENT
Masking
NONE
Model
SINGLE_GROUP

Eligibility

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

Timeline & Regulatory

Start
2024-01-01
Primary Completion
2026-12-06
Completion
2027-01-01

Countries

  • China

Study Locations

More Related Trials

Entities

Drugs

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 NCT07446452 on ClinicalTrials.gov