Inclusion Criteria:
1. Age ≥18 years old, male or female
2. Hepatocellular carcinoma patients diagnosed by cytology or tissue puncture, or who meet clinical diagnostic criteria and cannot be treated with radical treatment (radical surgery, ablation, radiotherapy, etc.)
3. Disease progression after first-line targeted combined immune system therapy (as per RECIST1.1 criteria)
4. Life expectancy exceeds 3 months
5. ECOG physical condition score 0\~1
6. Women of childbearing age must have a serum pregnancy study done within 7 days before the first medication, and the result is negative. Female subjects of reproductive age and male subjects whose partners are women of reproductive age must consent to contraception within 24 weeks from the date of signing the informed consent to the last administration of the study drug
7. Before the first dose of the investigational drug, the laboratory test values met the following conditions: ①blood routine (no blood transfusion within 14 days before screening, no hematopoietic stimulating drug correction) : white blood cell count (WBC) ≥ 2.0 × 109/L; platelet (PLT) ≥ 60× 109/L; hemoglobin content (HGB) ≥ 8.0 g/dL; ② Liver function: aspartate transferase (AST) ≤ 2.5x ULN; alanine aminotransferase (ALT) ≤ 2.5 x ULN; Serum total bilirubin (TBIL) ≤ 1.5 x ULN (except Gilbert syndrome total bilirubin ≤ 3.0 mg/dL); ③ Renal function: serum creatinine ≤ 1.5 x ULN or creatinine clearance rate (CrCl) ≥ 50 mL/minute; ④ Coagulation function: international normalized ratio (INR) ≤ 1.5 x ULN, activated partial thromboplastin time (APTT) ≤ 1.5 x ULN (only for patients who are not currently receiving anticoagulant therapy, patients who are currently receiving anticoagulant therapy should receive a steady dose of anticoagulant therapy)
8. The subjects voluntarily joined the study, signed the informed consent, had good compliance, and cooperated with the follow-up
Exclusion Criteria:
1. Pathological types of other non-hepatocellular carcinomas, including fibrolamellar hepatocellular carcinoma, sarcomatoid hepatocellular carcinoma, cholangiocarcinoma, etc. previously confirmed by histology/cytology
2. Child-Pugh grade of liver function ≥7 points
3. Major cardiovascular impairment in the 6 months prior to initial administration of the drug, such as a New York Heart Association (NYHA) Class II or higher history of congestive heart failure, unstable angina, myocardial infarction or stroke, or arrhythmia associated with hemodynamic instability; Corrected QT (QTc) interval lengthening \>480ms
4. Other malignancies developed ≤ 5 years before the first dose, except for fully treated cervical carcinoma in situ, basal cell or squamous cell skin cancer, local prostate cancer after radical surgery, and ductal carcinoma in situ after radical surgery (hormone therapy for non-metastatic prostate cancer or breast cancer is allowed)
5. Have had an active autoimmune disease in the past 2 years that requires systemic treatment, including but not limited to autoimmune hepatitis, lupus erythematosus, etc
6. Uncontrolled active infection, such as active tuberculosis, HIV infection, etc.; Patients with HBV-DNA replication level below 10000IU/mL and continuous oral antiviral therapy could be enrolled.
7. Had undergone major surgery in the 28 days prior to randomization or planned to undergo major surgery during the study period
8. Use of live attenuated vaccine within 28 days prior to randomization, or anticipated use of such live attenuated vaccine during the study period (patients are not allowed to receive live attenuated influenza vaccine 4 weeks prior to randomization, during treatment, and within 5 months after the final administration of adbelizumab)
9. Received any other investigational drug treatment or participated in another interventional clinical study within 4 weeks prior to signing the ICF
10. Use of corticosteroids (\> 10 mg/ day prednisone or equivalent dose) or other immunosuppressants within ≤ 14 days prior to the first dose of the study drug. Allowing inhaled or topical use of steroids and adrenal replacement steroids in the absence of active autoimmune disease; Patients received systemic immunosuppressive drugs (including but not limited to glucocorticoids, cyclophosphamide, azathioprine, methotrexate, thalidomide, and anti-tumor necrosis factor \[anti-TNF\] drugs) within 1 week prior to randomization. Patients receiving short-term, systemic immunosuppressant therapy, such as glucocorticoids for nausea, vomiting, or anaphylaxis management or prevention, may be enrolled in the study after investigator review. To allow the use of inhaled corticosteroids in patients with chronic obstructive pulmonary disease, corticosteroids such as fluhydrocortisone in patients with postural hypotension, and low-dose glucocorticoid supplements for adrenal insufficiency; Known mental illness, alcoholism, inability to quit smoking, drug or substance abuse
11. In the investigator's judgment, the subjects have other factors that may lead to the forced termination of the study, such as non-compliance with the protocol, other serious illnesses (including mental illness) requiring combined treatment, serious laboratory abnormalities, family or social factors that may affect the safety of the subjects, or the collection of data and samples
