Inclusion Criteria:
1. Patients who have signed ICF and are able to perform follow-up visits and relevant procedures required in the protocol;
2. Age ≥ 18 years (at the time of signing the ICF);
3. Clinically, histologically or pathologically confirmed hepatocellular carcinoma without extrahepatic metastases;
4. No previous treatment containing PD- (L) 1 inhibitor and Lenvatinib;
5. Potentially resectable HCC: (1)At least one measurable lesion (according to RECIST 1.1 criteria); (2)Patients with stage IIb/IIIa (equivalent to BCLC B/C) with portal vein tumor thrombus (according to Japanese PVTT grading criteria Vp3-Vp4) or more than three tumor nodules; (3)According to the assessment of the site multidisciplinary team (MDT), like surgical resection is not currently the treatment of choice;
6. ECOG score: 0 \~ 1;
7. Child-Pugh score of ≤ 7
8. Estimated survival of more than 6 months;
9. Vital organ function meets the following requirements: (1) Blood routine: Absolute neutrophil count (ANC) ≥ 1.5 × 109/L; Platelet count (PLT) ≥ 100 × 109/L; Hemoglobin (HGB) ≥ 90 g/L; (2) Liver function: Serum creatinine (Cr) ≤ 1.5 × upper limit of normal (ULN) or clearance of creatinine ≥ 50 mL/min (Cockcroft-Gault formula); Total bilirubin (TBIL) ≤ 1.5 × upper limit of normal (ULN); Aspartate aminotransferase (AST) or alanine aminotransferase (ALT) levels ≤ 2.5 × upper limit of normal (ULN); (3) Kidney function: Urine protein \< 2 +; if urine protein ≥ 2 +, 24-h urine protein quantitation test result should be ≤ 1 g;
10. Normal coagulation function, no active bleeding and thrombosis (1) International normalized ratio (INR) ≤ 1.5 × ULN; (2) Active partial thromboplastin time (APTT) ≤ 1.5 × ULN; (3) Prothrombin time (PT) ≤ 1.5 × ULN;
11. Female patients of childbearing age or male patients with female sexual partners of childbearing age should take effective contraceptive measures during study treatment and for 3 months after the end of study treatment; serum or urine HCG tests must be negative and must be non-lactating within 7 days before study enrollment;
12. Patients should be compliant and cooperative with safety and survival follow-up.
Exclusion Criteria:
1. Participate in other interventional clinical studies;
2. Previous or concurrent other malignancies;
3. History of liver transplantation or undergo liver transplantation;
4. History of hypersensitivity to macromolecular protein preparations, the study drug or any of the excipients;
5. Active autoimmune disease or history of autoimmune diseases (such as the following, but not limited to: autoimmune hepatitis, interstitial pneumonia, uveitis, enteritis, hepatitis, hypophysitis, vasculitis, nephritis, hyperthyroidism, hypothyroidism, previous thyroid surgery); Require bronchodilators for medical intervention of asthma; the patient has vitiligo or has complete remission of asthma in childhood, no intervention is required after adults can be included;
6. Use immunosuppressive agents, or systemic or absorbable local hormone therapy to achieve immunosuppressive purposes (dose \> 10 mg/day prednisone or other effective hormones), and continue to use within 2 weeks before enrollment;
7. Uncontrolled cardiac clinical symptoms or diseases, for example: (1) NYHA class 2 or higher heart failure;(2) Unstable angina pectoris; (3) Myocardial infarction within 1 year; (4) Clinically significant supraventricular or ventricular arrhythmia requiring treatment or intervention;
8. Use traditional Chinese medicine immunomodulator within 2 weeks before enrollment;
9. Severe active infection or unexplained fever \> 38.5 degrees during screening and before the first dose (subjects can be enrolled due to tumor-induced fever at the investigator discretion);
10. Congenital or acquired immunodeficiency: (1)HIV infection; (2)Active hepatitis (hepatitis B reference: HBV DNA ≥ 1000 IU/mL; hepatitis C reference: HCV RNA ≥ 1000 IU/mL); chronic hepatitis B virus carriers, HBV DNA \< 2000 IU/ml, must receive concurrent antiviral therapy during the trial to be enrolled;
11. Live vaccines less than 4 weeks prior to study medication or likely during the study;
12. History of psychiatric drug abuse, alcoholism, or drug abuse;
13. Chinese herbal medicine within 4 weeks prior to first treatment;
14. Factors that may cause forced halfway termination of this study, such as other serious diseases (including mental illness) requiring concomitant treatment, serious laboratory abnormalities, accompanied by family or social factors, which may affect the subject' s safety, the collection of data and samples, or other circumstances which are unsuitable for subject enrollment as judged by the investigator.
