The purpose of this study is to evaluate the safety and effectiveness in the treatment of recurrent glioblastoma with Cadonilimab combined with fractionated radiotherapy.

Inclusion Criteria:

1. . Written and signed informed consent.
2. . Male or female, age≥ 18 and ≤ 75 years old on day of signing informed consent.
3. Epitentorial glioblastoma confirmed by pathology; Diagnosis of recurrence through clinical imaging evidence.
4. The maximum diameter of recurrent tumor is less than 6 cm.
5. Concurrent radiotherapy and chemotherapy with standard STUP treatment scheme in the past.
6. The interval from the last radiotherapy is more than 6 months.
7. KPS (Karnofsky function status score)>60.

Exclusion Criteria:

1. Prior use of investigational products or devices within 4 weeks prior to the first administration of the study treatment.
2. Concurrent enrollment into another clinical study, except the study belongs to investigational, non-interventional studies or the follow-up period of interventional studies.
3. Multiple malignant gliomas.
4. Subtentorial glioblastoma or Extracranial metastatic lesions.
5. Active autoimmune diseases.
6. Known history of primary immunodeficiency virus infection or known history of testing positive for human immunodeficiency virus (HIV).