Breast Cancer Clinical Trials

• Age ≥ 18 years old, regardless of gender;

• ECOG Performance Status of 0-2;

• Histologically or cytologically confirmed HR-negative and HER2-negative breast cancer; there is evidence of metastasis; not suitable with curative surgery or radiation therapy; HR negative is defined as: ER-negative and PR-negative, the proportion of positively stained tumor cells in all tumor cells is \< 10%; HER2- negative is defined as: histologically confirmed to be HER2 IHC (0) or HER2 IHC(1+) or HER2 IHC (2+) and FISH(-);

• MRI confirmed brain metastases, at least one intracranial parenchymal metastatic lesion with a longest diameter ≥ 1.0 cm without prior radiotherapy; For lesions with prior radiotherapy, progressive disease post radiotherapy must be confirmed by MRI

• Any conditions deemed by the investigator to make the patient unnecessary for local therapy;

• Life-expectancy ≥ 3 months;

• Intraventricular catheter shunt to reduce intracranial pressure or treatment with mannitol, hormones, and anticonvulsants was permitted prior to the first dose, but the dose of medication was stable for at least one week without increment and neurological symptoms were stable for ≥1 week;

• Adequate function of major organs meets the following requirements:

⁃ (1)Blood routine: ANC≥1.5×109/L; PLT≥75×109/L; Hb ≥90 g/L(Allows blood transfusion or the use of medication to ensure that the content of hemoglobin) ; (2)Coagulation: INR≤1.5; APTT≤1.5×ULN ; (3)Blood biochemistry：TBIL≤1.5 × ULN; ALT and AST≤3 × ULN (liver metastasis≤5.0 × ULN); Urea nitrogen ≤1.5 × ULN; Cr≤1.5 × ULN or creatinine clearance ≥50 mL / min (Cockcroft-Gault formula) ; (4)Cardiac ultrasound: LVEF≥50%; (5)12-lead ECG: females QTcF interval \< 470 ms and males \< 450 ms; 9. Willing to join the study, sign informed consent, have good compliance and can cooperate with follow-up.