A Trial of HRS-2189 in Combination With Fluvastatin±HRS-6209, or HRS-8080±HRS-6209, or HRS-6209+HRS-1358 in Breast Cancer Patients

Inclusion Criteria:

1. ECOG physical condition 0-1 point.

2. Advanced unresectable or metastatic breast cancer confirmed by histopathology orcytopathology.

3. Menopausal Status.

4. Previous treatments: (New) adjuvant endocrine therapy combined or not combined withCDK4/6 inhibitors during or within 12 months after treatment, includingrecurrence/metastasis, shall be counted as one line of endocrine therapy and oneline of CDK4/6 inhibitor therapy (such as combined CDK4/6 inhibitors);Relapse/metastasis during (new) adjuvant chemotherapy or within 6 months after theend of treatment (whichever occurs later), counted as one line of chemotherapy.

5. Disease progression confirmed by imaging during or after the last systemicanti-tumor treatment before the first use of medication (limited to the stage ofefficacy expansion).

6. There must be at least one measurable extracranial lesion that meets RECIST v1.1 atbaseline.

7. Expected survival>3 months.

8. The functional level of 8 organs is good.

9. Previous treatments: The interval between receiving nitrosourea or mitomycin Cbefore the first medication in this study was ≥ 6 weeks; Receiving cytotoxic drugs,endocrine therapy, immunotherapy, targeted therapy, surgical interval (excludingbiopsy or PICC catheterization or PORT infusion port catheterization surgery), orother clinical studies with the last dose of medication ≥ 4 weeks; The intervalbetween the end of radiotherapy is ≥ 2 weeks.

10. female participants with fertility must agree to use efficient contraceptivemeasures for contraception during the study treatment period and within 7 monthsafter the end of the study treatment period; Female subjects with fertility musthave a negative serum HCG test within 7 days prior to enrollment in the study andmust be non lactating.

11. Voluntarily participate in this clinical trial, willing and able to comply with theclinical visit and research related procedures, understand the research procedures,and have signed informed consent.

Exclusion Criteria:

1. Patients with active (uncontrolled or symptomatic) brain metastases, cancerousmeningitis, spinal cord compression, or a history of primary CNS tumors; patientswith brain metastases who have completed treatment at least 28 days prior to firstuse of the study drug and are asymptomatic can be considered for enrollment if theyhave been confirmed asymptomatic by cranial imaging studies such as CT, MRI, orvenography without evidence of cerebral hemorrhage, and have completed treatment atleast 28 days before the first use of the study drug.

2. Patients with a history of severe cardiovascular disease, including: (1) Congestiveheart failure (NYHA Class>2); (2) Severe/unstable angina, new angina within the last 3 months; (3) Myocardial ischemia requiring long-term medication control; patientswith NYHA Class III-IV heart failure; (4) Acute myocardial infarction within thelast 6 months; (5) Any grade 2 or higher supraventricular or ventricular arrhythmiathat requires treatment or intervention; (6) Atrial fibrillation,coronary/peripheral artery bypass grafts, or cerebrovascular symptoms includingtransient ischemic attacks.

3. Patients with factors affecting oral medication intake, such as difficultyswallowing or intestinal obstruction, or have active gastrointestinal diseases orother diseases that may significantly affect drug absorption, distribution,metabolism, or excretion (active inflammatory bowel disease or chronic diarrhea,enterocolitis or upper gastrointestinal surgery, including gastrectomy).

4. Patients with uncontrollable third space effusions (such as large ascites, pleuraleffusion, pericardial effusion) or cancerous lymphedema.

5. Pregnant women, nursing mothers, or those planning to become pregnant during thestudy period.

6. Patients with significant liver disease history, untreated active hepatitis B (defined as positivity for HBsAg or HBcAb and HBV-DNA levels above the normal upperlimit), or active hepatitis C (defined as HCV-RNA levels above the detection limit).

7. Patients with uncontrolled chronic systemic comorbidities (such as severe chroniclung, liver, kidney or heart diseases).

8. Patients with active autoimmune diseases, history of immune deficiency, autoimmunedisease history, or history of diseases or syndromes requiring systemiccorticosteroid hormones or immunosuppressive drug therapy, or have acquired (HIVinfection) or congenital immunodeficiency diseases, or have a history of organtransplantation (including homologous bone marrow transplantation).

9. Patients with active infectious tuberculosis and need for antimicrobial treatment.

10. Patients with known significant liver disease history, untreated active hepatitis B (defined as positivity for HBsAg or HBcAb and HBV-DNA levels above the normal upperlimit), or active hepatitis C (defined as HCV-RNA levels above the detection limit).

11. Patients who have had other malignancies within the past 5 years, except: 1)Completely cured skin basal cell carcinoma and cervical intraepithelial neoplasia;

2. Completely cured and without recurrence of secondary primary cancer within 5years.

12. Patients who have used strong or moderate inhibitors of CYP3A4 within 1 week beforethe first dose or strong or moderate inducers of CYP3A4 within 2 weeks before thefirst dose.

13. Pregnant women, nursing mothers, or those planning to become pregnant during thestudy period.

14. Patients with a history of neurological or psychiatric disorders, or those with ahistory of abuse of psychotropic drugs or drug addiction.

15. Patients who are expected to receive other anti-tumor treatments or medicationsduring this study.

16. Patients with other serious physical or laboratory abnormalities that may increasethe risk of participating in the study or interfere with study results, and thosedeemed by the investigator not suitable for participation in this study.

17. Patients with anti-tumor treatment-related toxicity in the past (excluding alopecia;according to the judgment of the investigator， after consultation with the sponsor,some tolerable chronic Grade II toxicities may be excluded).

18. Patients who have an allergy to any study drug or any excipient.