A Clinical Study of Hetrombopag Olamine Tablets for Thrombocytopenia Induced by Chemotherapy in Advanced Breast Cancer

Inclusion Criteria:

1. The patients signed the informed consent and voluntarily joined the study;
2. Age 18-75 years old, male or female;
3. Patients with advanced breast cancer diagnosed by histopathology or cytology, who arereceiving and continue to receive the same chemotherapy regimen;
4. Can accept the current chemotherapy regimen (must be platinum-containing chemotherapyregimen: lobaplatin, carboplatin, cisplatin, etc.) for at least 2 cycles;
5. The first occurrence of platelets <50×109/L in the current chemotherapy cycle;
6. The investigator determines that the patient can receive hetrombopag administration;
7. Neutrophil count ≥ 1.0×109/L, hemoglobin ≥ 80g/L before administration ofHaitrombopag;
8. Life expectancy at screening ≥ 12 weeks;
9. ECOG: 0-1;
10. The main organ functions are normal, and there are no serious complications.

Exclusion Criteria:

1. Women who are pregnant or breastfeeding;
2. Unable to understand the research nature of the research or have not obtained informedconsent;
3. The investigator judges other circumstances that are not suitable for inclusion in thestudy;
4. Thrombocytopenia caused by other causes (chronic liver disease, sepsis, disseminatedintravascular coagulation, immune thrombocytopenia, etc.);
5. Patients with unstable angina pectoris, congestive heart failure, uncontrolledhypertension, uncontrolled arrhythmia or recent history (within 1 year of screening)of myocardial infarction;
6. Those with a history of blood disease or tumor bone marrow infiltration;
7. Those who received simultaneous radiotherapy and those who received pelvicradiotherapy in the past;
8. Arterial or venous thrombotic events within the past 6 months;
9. There are currently uncontrollable infections;
10. Clinical manifestations of severe bleeding within 2 weeks before screening, such asgastrointestinal or central nervous system bleeding;
11. Need emergency treatment, such as superior vena cava syndrome, spinal cordcompression;
12. The absolute value of neutrophils is less than 1.0×109/L, and the hemoglobin is lessthan 80g/L, and granulocyte colony-stimulating factor, red blood cells, and EPOinfusion therapy in accordance with clinical routine are allowed;
13. Obvious abnormal liver function: patients without liver metastases, ALT/AST>3ULN (upper limit of normal value), TBIL>3ULN; patients with liver metastases,ALT/AST≥5ULN, TBIL≥5ULN;
14. Abnormal renal function: serum creatinine ≥ 1.5ULN or eGFR ≤ 60 ml/min (Cockcroft-Gault formula);
15. Received thrombopoietin receptor agonist drugs (such as Eltrombopag, Romigrastim), orrecombinant human thrombopoietin (rhTPO), recombinant human interleukin-11 (rhIL) within 1month before screening -11) Treatment; 17. Received platelet transfusion within 3 daysbefore randomization; 18. Patients with known or expected hypersensitivity or intoleranceto the active ingredients or excipients of Hetrombopag ethanolamine tablets.