Efficacy and Safety of KN026 in Combination With HB1801 in the First-line Treatment of Subjects With HER2-positive Recurrent or Metastatic Breast Cancer.

Shanghai JMT-Bio

Status and phase: Enrolling; Phase 3

Conditions: First-line Treatment of HER2-positive Recurrent or Metastatic Breast Cancer

Treatments: Drug: Pertuzumab; Drug: Trastuzumab; Drug: Recombinant Humanized Bispecific antibody against HER2，KN026; Drug: HB1801; Drug: Docetaxel

Study type: Interventional

Funder types: Industry

Identifiers

NCT05838066

KN026-003

Details and patient eligibility

About

This is a randomized, controlled, open-label, multicenter, phase Ш clinical study designed to compare the efficacy and safety of KN026 in combination with HB1801 to trastuzumab in combination with pertuzumab and docetaxel in the first-line treatment of subjects with HER2-positive recurrent or metastatic breast cancer. The statistical assumption for this study is superiority. The primary study endpoint was PFS as assessed by Blinded Independ Review Committee (BIRC).

Full description

The purpose of this study is to assess the efficacy and safety of KN026 combined with HB1801 versus trastuzumab combined with pertuzumab and docetaxel as first-line treatment for HER2-positive recurrent or metastatic breast cancer. This study will establish an independent data monitoring committee (IDMC) to conduct safety assessments after approximately 20 subjects in the treatment group complete the first cycle of treatment. During the safety assessment period, the study will continue to enroll subjects, and safety review meetings will be at 1 year of randomization in the first subject. In addition, the IDMC plans to conduct one interim analysis of efficacy during the study period.

The primary study hypotheses are that the combination of KN026 combined with HB1801 is superior to trastuzumab combined with pertuzumab and docetaxel with respect to: Progression-free Survival (PFS) as assessed by the BIRC per Response Evaluation Criteria in Solid Tumors (RECIST 1.1).

Enrollment: 880 estimated patients

Sex: All

Ages: 18+ years old

Volunteers: No Healthy Volunteers

Inclusion and exclusion criteria

Key Inclusion Criteria:

• Voluntarily enrolled in this study and signed an informed consent form (ICF).
• Age ≥ 18 years.
• Recurrent or metastatic breast cancer confirmed by histology and/or cytology.
• Latest tumor tissue sample confirmed as HER2 positive by central laboratory testing.
• No prior systemic chemotherapy and/or HER2-targeted therapy for recurrent or metastatic breast cancer.
• Eastern Cooperative Oncology Group (ECOG) physical status score of 0 - 1.
• Presence of lesion (RECIST 1.1).
• Adequate organ and bone marrow function

Key Exclusion Criteria:

• Ineligible for any of the agents on the study
• Untreated or unstable parenchymal metastases, spinal cord metastases or compression, or carcinomatous encephalitis.
• Pregnant or lactating women.
• Presence of other circumstances that may interfere with the subject's participation in the study procedures or are inconsistent with the maximum benefit of the subject's participation in the study or affect the results of the study: e.g., history of mental illness, drug or substance abuse, any other disease or condition of clinical significance, etc.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: None (Open label)

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880 participants in 2 patient groups

KN026+HB1801

Experimental group

Description:

Subjects will receive an intravenous (IV) infusion of KN026 plus HB1801. All subjects are required to receive study treatment as planned until investigator-assessed loss of benefit, toxic intolerance, withdrawal of consent, loss to follow-up, or death, whichever occurrs first.

Treatment:

Drug: HB1801

Drug: Recombinant Humanized Bispecific antibody against HER2，KN026

Trastuzumab + Pertuzumab + Docetaxel

Active Comparator group

Description:

On Day 1 of each 21-day cycle, patients will receive an intravenous (IV) infusion of Pertuzumab 840 mg loading dose followed by 420 mg per cycle, IV, D1, Q3W, in combination with trastuzumab 8 mg/kg loading dose followed by 6 mg/kg per cycle, IV, D1, Q3W and docetaxel 75 mg/m\^2. All subjects are required to receive study treatment as planned until investigator-assessed loss of benefit, toxic intolerance, withdrawal of consent, loss to follow-up, or death, whichever occurred first.

Treatment:

Drug: Docetaxel

Drug: Trastuzumab

Drug: Pertuzumab