ARX788 in HER2-positive Metastatic Breast Cancer Patients Who Were Previously Treated With T-DXd

Inclusion criteria

• 18 to 75 years old (including upper and lower limits), male or female;
• Unresectable locally advanced, recurrent or metastatic BC;
• Tissue samples determined to be HER2 positive (defined as IHC3+ or FISH+);
• Received T-DXd treatment in the advanced stage;
• Adequate bone marrow, liver, kidney and coagulation function;
• Voluntarily sign the informed consent, have good compliance and are willing to comply with the follow-up visit.

Exclusion criteria

• With meningeal metastases or disseminated brain metastases or active brain metastases;
• Has interstitial lung disease requiring steroid therapy, a history of drug-induced interstitial lung disease, a history of radiation pneumonitis, or any evidence indicating clinically active interstitial lung disease;
• Has any eye disease that require medical intervention such as keratitis, corneal diseases or active eye infection;
• Has cardiac insufficiency;
• Has received any systemic anti-tumor therapy (with the exception of endocrine therapy, with an interval of at least 7 days) within 28 days (or at least 5 half-lives) before the first use of the investigational product;