This study will look at the efficacy and safety of QL1706 plus albumin-bound paclitaxel and carboplatin in a neoadjuvant setting, in high-risk, TNBC early breast cancer.

This study is a single-arm, single-center, phase II clinical study designed to observe and evaluate the efficacy and safety of QL1706 combined with Pcb regimen in the neoadjuvant treatment of early-stage high-risk TNBC breast cancer.

It is planned to enroll 73 subjects. After the subjects are enrolled in the study, they will receive 6 cycles of QL1706 combined with PCb regimen. A 3-week treatment cycle is used until the treatment termination event specified in the protocol occurs. The subjects will continue to undergo postoperative efficacy and safety visits after ending of the treatment.

Inclusion Criteria:

1. Voluntarily join this study and sign the informed consent form;
2. Female patients aged ≥18 years and ≤70 years old who are newly diagnosed with breast cancer. According to the definition of the latest ASCO/CAP guidelines, histopathologically confirmed TNBC breast cancer, histological grade II, TNM stage T1cN1-cN2 or T2-T4, cN0-cN2;
3. According to RECIST 1.1, there is at least one measurable lesion;
4. ECOG score: 0~1;
5. Tumor tissue specimens that can be used for biomarker detection;

The function of vital organs meets the following requirements (no blood components or cell growth factor drugs are allowed within 14 days before the first medication):

Inclusion Criteria:

1. Voluntarily join this study and sign the informed consent form; Female patients aged ≥18 years and ≤70 years old who are newly diagnosed with breast cancer. According to the definition of the latest ASCO/CAP guidelines, histopathologically confirmed ER+/HER2- breast cancer, histological grade II, Ki-67 ≥ 20% and TNM stage T1c-T2, cN1-cN2 or T3- T4, cN0-cN2;
2. According to RECIST 1.1, there is at least one measurable lesion; ECOG score: 0~1; Tumor tissue specimens that can be used for biomarker detection;

The function of vital organs meets the following requirements (no blood components or cell growth factor drugs are allowed within 14 days before the first medication):

(1) Absolute neutrophil count ≥1.5×109/L; (2) Platelets ≥100×109/L; (3) Hemoglobin ≥90 g/L; (4) Serum albumin ≥30 g/L; (5) Thyroid-stimulating hormone (TSH) ≤1×ULN (if abnormal, the FT3 and FT4 levels should be examined at the same time. If the FT3 and FT4 levels are normal, you can be included in the group); (6) Serum total bilirubin ≤1.5×ULN; (7) ALT and AST ≤2.5×ULN, if liver metastasis is present, ALT and AST ≤5ULN; (8) AKP≤2.5×ULN; Serum creatinine ≤1.5×ULN; (9) International normalized ratio (INR) ≤1.5 (not receiving anticoagulant therapy).

Exclusion Criteria:

1. The presence of any active autoimmune disease or a history of autoimmune disease (such as the following, but not limited to autoimmune hepatitis, interstitial pneumonia, uveitis, enteritis, hypophysitis, vasculitis, nephritis, hyperthyroidism;
2. Those who suffer from vitiligo or whose asthma has been completely relieved in childhood and do not need any intervention in adulthood can be included; asthma that requires medical intervention with bronchodilators cannot be included);
3. Are currently using immunosuppressants or systemic hormone therapy to achieve immunosuppression (dose >10 mg/day prednisone or other effective hormones), and are still using it within 2 weeks before enrollment;
4. Severe allergic reactions to other monoclonal antibodies; Known history or evidence of interstitial lung disease or active non-infectious pneumonia;
5. Those with known central nervous system metastasis;
6. Suffered from other malignant tumors in the past 5 years or at the same time (except cured basal cell carcinoma of the skin and cervical cancer in situ);
7. Suffering from high blood pressure that cannot be well controlled by antihypertensive drug treatment (systolic blood pressure ≥140 mmHg or diastolic blood pressure ≥90 mmHg); the above parameters are allowed to be achieved through the use of antihypertensive treatment; there has been a hypertensive crisis or high blood pressure in the past Hypertensive encephalopathy;
8. Have cardiac clinical symptoms or diseases that cannot be well controlled, such as (1) NYHA grade 2 or above heart failure (2) Unstable angina (3) Myocardial infarction within 1 year (4) Clinically significant supraventricular infarction or ventricular arrhythmia requiring treatment or intervention (5) QTc>450ms (male); QTc>470ms (female);
9. Those who are receiving thrombolysis or anticoagulation therapy are allowed to use low-dose aspirin and low-molecular-weight heparin prophylactically;
10. Have clinically significant bleeding symptoms or a clear bleeding tendency within 3 months before enrollment; if fecal occult blood is positive during the baseline period, it can be re-examined. If it is still positive after the reexamination, a gastroscopy is required;
11. The tumor invades important blood vessels, or the researcher determines based on imaging that there is a high possibility that the cancer will invade important blood vessels in the future study period, which may lead to fatal bleeding;
12. Patients with pleural effusion, ascites or pericardial effusion that require drainage can be enrolled if the researcher assesses that the symptoms are stable after drainage;
13. Arterial/venous thrombosis events that occurred within 6 months before enrollment, such as cerebrovascular accidents (including transient ischemic attack, cerebral hemorrhage, cerebral infarction), deep vein thrombosis and pulmonary embolism;
14. Known hereditary or acquired bleeding and thrombotic tendencies (such as hemophilia patients, coagulation disorders, etc.);
15. Major vascular disease (for example, aortic aneurysm requiring surgical repair or recent peripheral arterial thrombosis) within 6 months before the start of study treatment;
16. Urine routine shows urine protein ≥ ++ and confirmed 24-hour urine protein amount >1.0 g;
17. Suffering from active infection, unexplained fever ≥38.5℃ within 7 days before taking the drug, or baseline white blood cell count >15×109/L;
18. Those with congenital or acquired immune deficiency (such as HIV infection); those who are hepatitis B surface antigen (HBsAg) positive and hepatitis B virus deoxyribonucleic acid (HBV DNA) ≥ 2000 IU/ml, or hepatitis C virus antibody positive; Have received live vaccines less than 4 weeks before study medication or may be vaccinated during the study period;
19. In the judgment of the researcher, the patient has other factors that may affect the study results or cause the study to be terminated midway, such as alcoholism, drug abuse, other serious diseases (including mental illness) that require combined treatment, and serious laboratory tests. Abnormalities, accompanied by family or social factors, may affect the patient's safety.