Adebrelimab Combined With Bevacizumab and Albumin Paclitaxel in Non-squamous NSCLC After First-line Treatment

Inclusion Criteria:

1. voluntarily enrolled in this study and signed the Informed Consent Form (ICF).
2. age ≥ 18 years and both sexes
3. patients with metastatic or recurrent stage IV non-squamous NSCLC (AJCC 8th edition TNM stage) proven by histopathological or cytopathological diagnosis, mainly including adenocarcinoma, large cell lung cancer, adenocarcinoma with squamous differentiation or adenosquamous carcinoma with predominantly adenocarcinoma component may also be enrolled if eligible by study assessment.
4. objective imaging progression (RECIST v1.1 assessment) after subjects have received a first-line regimen containing immune checkpoint inhibitor therapy.
5. the best outcome of first-line immune checkpoint inhibitor-containing therapy is SD, PR, CR, and PFS of ≥ 3 months on first-line therapy.
6. imaging evaluation (CT or MRI) with at least one measurable target lesion (according to RECIST v1.1 criteria) within 4 weeks prior to enrollment.
7. an ECOG PS score of 0-1 within 4 weeks prior to enrollment.
8. an expected survival of ≥ 12 weeks.
9. function of vital organs in accordance with the following requirements. (1) blood routine: white blood cell count (WBC) ≥ 3.0×109/L; absolute neutrophil count (ANC) ≥ 1.5×109/L; platelets (PLT) ≥ 100×109/L; hemoglobin level (HGB) ≥ 9.0 g/dL (no corresponding supportive treatment such as blood transfusion and leukocyte boosting within 7 days).

(2) Liver function: aspartate aminotransferase (AST) and alanine aminotransferase (ALT) ≤ 2.5 times ULN in patients without liver metastases, ALT and AST ≤ 5 times ULN in patients with liver metastases; serum total bilirubin (TBIL) ≤ 1.5 times ULN (except total bilirubin \< 3.0 mg/dL in Gilbert syndrome); albumin (ALB) ≥ 30 g/L, alkaline phosphatase (ALP) ≤ 2.5×ULN, and in patients with bone metastases, ALP ≤ 5×ULN.

(3) renal function: serum creatinine ≤ 1.5 times ULN or creatinine clearance (CrCl) ≥ 50 mL/min (using Cockcroft/Gault formula); urine protein (UPRO) \< (++), or 24-hour urine protein amount \< 1.0 g.

(4) Coagulation function: international normalized ratio (INR) ≤ 1.5 and activated partial thromboplastin time (APTT) ≤ 1.5 times ULN; if the patient is receiving anticoagulation therapy, as long as PT or APTT is within the therapeutic range of the intended use of anticoagulants, referring to the relevant drug instructions.

(5) Thyrotropin (TSH) ≤ upper limit of normal (ULN); if abnormal, T3 and T4 levels should be examined; normal T3 and T4 levels are eligible for enrollment.

10\. Non-surgical sterilization or female patients of childbearing age must have a negative serum pregnancy test within 7 days prior to the first dose and must be non-lactating. Female patients of childbearing age or male patients whose partners are women of childbearing age must agree to use highly effective methods of contraception during the study period and for 6 months after the last administration of the study drug.

Exclusion Criteria:

1. patients with other pathological tissue types of non-small cell lung cancer (including squamous cell carcinoma, mixed non-small cell and small cell lung cancer, and predominantly squamous adenosquamous carcinoma of the lung)
2. patients with known EGFR-sensitive mutations (19Exon del/21Exon L858R), positive ALK/ROS1 fusion, BRAFV600E mutation, MET gene exon 14 jump mutation, positive RET gene fusion, and other patients with approved targets for targeted agents.
3. patients with imaging showing signs of tumor invasion into the great vessels, where the tumor has completely approached, encircled, or invaded the lumen of a great vessel (e.g., pulmonary artery or superior vena cava)
4. patients with hypertension whose blood pressure is not satisfactorily controlled by antihypertensive medication (sitting systolic blood pressure \> 150 mmHg, or diastolic blood pressure \> 100 mmHg), previous hypertensive crisis or hypertensive encephalopathy
5. those with a known hereditary bleeding tendency or coagulation disorders; those who have received full-dose anticoagulant or thrombolytic therapy within 10 days prior to enrollment, or those who have taken non-steroidal anti-inflammatory drugs with platelet inhibitory effects within 10 days prior to enrollment (except for prophylactic use of low-dose aspirin (≤325 mg/day)).
6. had a hemoptysis of 2nd degree or greater with a single hemoptysis of ≥1/2 teaspoon (2.5 ml) within 3 months prior to enrollment
7. thrombosis in the 6 months prior to enrollment and an arterial/venous thrombotic event within 1 year prior to screening, such as cerebrovascular accident (including transient ischemic attack), deep vein thrombosis, and pulmonary embolism.
8. those with severe vascular lesions (including aneurysms or arterial thrombosis requiring surgical treatment) within 6 months prior to enrollment
9. late first-line treatment with anti-angiogenic agents, including but not limited to bevacizumab, apatinib, anlotinib, ramucirumab, lenvatinib, etc.; treatment with paclitaxel, including paclitaxel, albumin paclitaxel, paclitaxel liposome, docetaxel (polyene paclitaxel), etc;