Study of JSKN016 Combination Therapy in Inoperable Locally Advanced or Metastatic HER2-Negative Breast Cancer

Phase 2RecruitingNCT06942234

Jiangsu Alphamab Biopharmaceuticals Co., Ltd180 enrolled

Overview

This study aims to evaluate the safety and effectiveness of JSKN016 in combination with different treatments for patients with HER2-negative breast cancer that cannot be removed by surgery or has spread to other parts of the body. The study includes four groups of patients based on treatment history and tumor characteristics. Each group will receive JSKN016 with chemotherapy or immunotherapy. The goal is to find out how well the treatment works and how safe it is.

This clinical study investigates the safety and efficacy of JSKN016 combined with various therapies for patients with advanced, inoperable, or metastatic HER2-negative breast cancer. The study includes four groups with different treatment regimens, targeting HR+HER2-negative breast cancer and triple-negative breast cancer (TNBC) with varying prior treatments. Participants will receive JSKN016 in combination with paclitaxel, capecitabine, eribulin, or pembrolizumab. The primary endpoint is the objective response rate (ORR) based on RECIST 1.1 criteria. The secondary endpoints include efficacy, safet, and other related outcomes.

Study Type

INTERVENTIONAL

Allocation

NON_RANDOMIZED

Purpose

TREATMENT

Masking

NONE

Enrollment

180

Conditions

Inoperable Locally Advanced HER2-Negative Breast Cancer Metastatic HER2-Negative Breast Cancer

Interventions

JSKN016DRUG

JSKN016 is administered via intravenous infusion at doses of 5mg/kg or 6mg/kg every 3 weeks, starting on Day 1 of each cycle. If the 5mg/kg dose is well tolerated during the safety lead-in phase, the dose may be increased to 6mg/kg for subsequent cycles.

CapecitabineDRUG

The drug is administered orally at a dose of 1000mg/m², twice daily for two weeks, followed by a one-week break. Treatment cycles repeat every three weeks.

Paclitaxel (albumin bound)DRUG

The drug is administered intravenously at a dose of 125mg/m², with infusions on Day 1 and Day 8 of each treatment cycle. The treatment cycle is repeated every 3 weeks.

EribulinDRUG

The drug is administered intravenously at a dose of 1.4mg/m², with infusions on Day 1 and Day 8 of each treatment cycle. The treatment cycle is repeated every 3 weeks.

PembrolizumabDRUG

The drug is administered intravenously at a fixed dose of 200mg, with infusions on Day 1 of each 3-week treatment cycle.

Eligibility

Sex: ALLMin age: 18 YearsMax age: 75 Years

Medical Language ↔ Plain English

Inclusion Criteria: 1. Capable of understanding and signing the informed consent form. 2. Aged ≥18 and ≤75 years, regardless of sex. 3. Histologically or cytologically confirmed inoperable locally advanced or metastatic HER2-negative breast cancer. 4. Hormone receptor-positive participants with progression/intolerance after standard endocrine therapy, or unsuitable for it. 5. Disease progression confirmed by radiological evidence post-systemic treatment. 6. Available archived or newly obtained tumor tissue/biopsy. 7. No prior systemic therapy for advanced disease, except for prior endocrine ± targeted therapy or CDK4/6 inhibitors. 8. Measurable non-CNS lesion per RECIST 1.1. 9. Expected survival ≥3 months. 10. ECOG performance status of 0 or 1. 11. Contraceptive use agreement for fertile participants. 12. Adequate organ function within 7 days of enrollment: * Bone marrow: ANC ≥1.5 × 10⁹/L, Hemoglobin ≥90 g/L, Platelets ≥100 × 10⁹/L. * Liver: Bilirubin ≤1.5 × ULN, ALT/AST ≤3 × ULN. * Renal: Creatinine ≤1.5 × ULN or Ccr ≥60 mL/min. * Coagulation: INR/PT ≤1.5 × ULN, APTT ≤1.5 × ULN. 13. LVEF ≥50%. Exclusion Criteria: 1. CNS metastasis (except stable cases treated with radiation or surgery). 2. Unstable spinal cord compression or untreated history. 3. Recent live vaccine (except seasonal flu vaccines). 4. Recent anti-tumor treatment within 28 days or 5 half-lives (whichever is shorter). 5. Recent palliative therapy within 14 days. 6. Major surgery within 28 days or planned during the study. 7. Severe gastrointestinal issues or recent major GI bleeding. 8. Uncontrolled pleural/peritoneal effusions or cachexia. 9. Prior HER3/TROP2-targeted therapy or topoisomerase I inhibitors. 10. Other malignancies within 5 years (except certain skin or localized cancers). 11. Current interstitial lung disease or uncontrolled infections. 12. Severe hypercalcemia or uncontrolled cancer-related pain. 13. Autoimmune diseases, unless stable with treatment. 14. Uncontrolled comorbidities (e.g., active infections, cardiovascular issues). 15. Toxicities from previous treatments not resolved to CTCAE ≤1. 16. Recent steroid use or need for systemic immunosuppressive therapy. 17. Allergy to study drug components. 18. Pregnancy or breastfeeding.

Outcomes

Primary Outcomes

Objetctive Response Rate (ORR)

The proportion of participants who achieve a confirmed complete response (CR) or partial response (PR), as assessed by investigators according to RECIST v1.1 criteria.

Time frame: From baseline until disease progression, death, or end of treatment, whichever occurs first (up to approximately 24 months)

Secondary Outcomes

Duration of Response (DoR)

The time from the first documentation of CR or PR to the first documentation of disease progression or death from any cause, whichever occurs first, as assessed by investigators per RECIST v1.1.

Time frame: From first documented response to progression or death (up to approximately 24 months)

Disease Control Rate (DCR)

The proportion of participants who achieve a best overall response of CR, PR, or stable disease (SD), as assessed by investigators using RECIST v1.1 criteria.

Time frame: From baseline to disease progression or end of treatment (up to approximately 24 months)

Progression-Free Survival (PFS)

Time from the date of first dose of study drug to the first documentation of disease progression or death from any cause, whichever occurs first, based on investigator assessment using RECIST v1.1.

Time frame: From first dose until disease progression or death (up to approximately 24 months)

Overall Survival (OS)

Time from the date of first dose of study drug to death from any cause.

Time frame: From first dose to death (up to approximately 36 months)

Frequency and Severity of Adverse Events (AEs)

Frequency and severity of treatment-emergent adverse events (TEAEs), treatment-related adverse events (TRAEs), serious adverse events (SAEs), and adverse events of special interest (AESIs), coded using MedDRA and graded per NCI-CTCAE v5.0.

Time frame: From first dose through 30 days after the last dose of study treatment (up to approximately 30 months)