SHR-1811 Combined With Carboplatin in the Treatment of Advanced Breast Cancer With HER2 Expression

Inclusion criteria

• . Women aged 18 to 75 (inclusive of both values).
• . Unresectable or metastatic breast cancer with HER2 positive (IHC 3+ or IHC 2+/ISH+), low HER2 expression (IHC 1+ or IHC 2+/ISH-), or ultra-low HER2 expression (IHC 0 with membrane staining) confirmed by histology or cytology.
• . Failure of standard treatment in the advanced stage.
• . For HER2+ metastatic breast cancer, one can have received second-generation ADC (such as T-DM1) treatment, but cannot have received third-generation ADC (such as T-DXd) treatment. For HER2 low expression or HER2 ultra-low expression metastatic breast cancer, it is necessary to meet the requirement that no ADC drug treatment has been received.
• . For HER2-positive metastatic breast cancer, at the metastatic stage, ≥1 line of anti-HER2 treatment must have been received; For HR-positive metastatic breast cancer with low or ultra-low expression of HER2, it is necessary to meet the failure of CDK4/6 inhibitor treatment at the metastatic stage. For HR-negative metastatic breast cancer with low or ultra-low expression of HER2, it is necessary to have received ≥ first-line chemotherapy at the metastatic stage.
• . The ECOG score is 0 or 1.
• . There is at least one lesion (including measurable or unmeasurable) according to the RECIST v1.1 standard.
• . Adequate organ function.

Exclusion criteria