Efficacy and Safety of SCAI of Bevacizumab Combined With IC of Tislelizumab in the Treatment of Recurrent Glioblastoma.

• 1, 18 ≤ age ≤ 75 years. 2. Recurrent glioblastoma who failed first-line therapy, with no more than 3 prior episodes of disease progression and at least one confirmed and evaluable lesion.

  3. ECOG score 0-2 points, expected survival time ≥ 3 months; 4. Stable neurological symptoms for more than 7 days; 5. If the previous surgical resection interval is at least 4 weeks, after receiving chemotherapy for 3 weeks, after receiving radiotherapy including whole brain radiotherapy, stereotactic radiotherapy and other radiotherapy for 3 months, if receiving other intrathecal treatment drugs washout period of 7 days.
  6. Neutrophil count ≥ 1.5 × 10 \^ 9/L, hemoglobin ≥ 80 g/L, platelets ≥ 75 × 10 \^ 9/L.
  7. Prothrombin time/international normalized ratio and partial thromboplastin time ≤ 1.5 × upper limit of normal; 8. Total bilirubin ≤ 1.5 × ULN, aspartate aminotransferase (AST) and alanine aminotransferase (ALT) ≤ 2.5 ×ULN, albumin ≥ 30 g/L, creatinine ≤ 2 × ULN, calculated creatinine clearance ≥ 50 mL/min, 24-hour urine creatinine clearance ≥ 50 mL/min; 9. subjects should agree to use adequate contraception from the first dose until 3 months after the last dose.

Exclusion Criteria:

• 1. Pregnant or lactating women. 2. Active infection requiring intravenous antibiotics requiring therapeutic anticoagulation with warfarin.

     3. History of allergy to monoclonal antibodies; 4. Use of non-tumor vaccines containing live viruses to prevent infectious diseases within 12 weeks before the study drug; 5. Subjects with serious medical, neurological or psychiatric disorders and judged to be unable to fully comply with study treatment or assessments; 6. Active infectious diseases within 7 days before starting the study drug; 7. Severe liver dysfunction (persistent grade 3 or greater liver adverse events) or known active chronic hepatitis, human immunodeficiency virus (HIV) or known acquired immunodeficiency syndrome (AIDS) test positive; 8. Patients with active autoimmune diseases requiring systemic treatment (i.e., the use of corticosteroids or immunosuppressive agents), except replacement therapy (e.g., thyroxine, insulin or physiological corticosteroid replacement therapy for adrenal or pituitary insufficiency), allowing inhalation or local steroids and adrenal replacement dose > 10 mg daily prednisone equivalent, requiring long-term systemic corticosteroid therapy (> 10 mg prednisone or equivalent per day) or any other immunosuppressive therapy (including anti-TNF-a therapy); 9. Investigate the allergic history of drug ingredients; 10. Inadequate control of hypertension (defined as systolic blood pressure > 150 and/or diastolic blood pressure > 100 mmHg (using antihypertensive drugs); 11. Any past history of hypertensive crisis or hypertensive encephalopathy; 12. New York Heart Association (NYHA) Class II or greater congestive heart failure; 13. History of myocardial infarction or unstable angina within 6 months prior to enrollment; 14. History of stroke or transient ischemic attack within 6 months prior to enrollment; 15. Severe vascular diseases (such as aortic aneurysm, aortic dissection); 16. Symptomatic peripheral vascular disease. 17. Evidence of bleeding diathesis or coagulopathy. 18. Major surgery, open biopsy or severe traumatic injury within 28 days prior to study enrollment, or major surgery is expected to be required during the course of the study.
     19. Core biopsy or other minor surgical procedures, excluding placement of vascular access devices, within 7 days prior to study enrollment.
     20. History of abdominal fistula, gastrointestinal perforation or intra-abdominal abscess within 6 months prior to study entry; 21. Severe, non-healing wounds, ulcers or fractures. 22. Urine protein to creatinine ratio ≥ 1.0 or urine protein ≥ 2 +. 23. Subjects with high intracranial pressure who are not suitable for lumbar puncture, and the researchers believe that they are not suitable for inclusion in the study.