PD-1 Monoclonal Antibody, Lenvatinib and TACE in the Treatment of HCC

Inclusion Criteria: 1. HCC confirmed by histology / cytology. 2. Age ≥ 18 years old. 3. Eastern Cooperative Oncology Group (ECOG) physical state score 0 or 1. 4. Barcelona clinical liver cancer (BCLC) stage B or stage C. 5. Participants who have not received other systemic anti-tumor treatment for HCC before the first administration, or who have received treatment but PD or SD ≥ 4 weeks. 6. Patients who had not received TACE before the first administration, or who had received TACE but SD ≥ 4 weeks. 7. According to RECIST v1.1, there is at least one measurable lesion. 8. Child Pugh score ≤ 7. 9. Participant has sufficient organ and marrow functions. 10. Expected survival time ≥ 12 weeks. 11. For women of childbearing age or male patients whose sexual partners are women of childbearing age, effective contraceptive measures should be taken during the whole treatment period and 6 months after the last medication. 12. Sign the written informed consent, and be able to follow the visit and relevant procedures specified in the plan Exclusion Criteria: 1. Fibrolamellar carcinoma, sarcomatoid carcinoma, cholangiocarcinoma and other components previously confirmed by histology / cytology. 2. History of hepatic encephalopathy or liver transplantation. 3. Pleural effusion, ascites and pericardial effusion with clinical symptoms requiring drainage. 4. Acute or chronic active hepatitis B or C infection, hepatitis B virus (HBV-DNA) \> 10\^6 copies / ml; hepatitis C virus (HCV-RNA) \> 10\^3 copies / ml; HBsAg and anti HCV antibody were positive at the same time. 5. There is central nervous system metastasis. 6. Bleeding of esophageal or gastric varices caused by portal hypertension occurred in the past 6 months, or severe (G3) varices were found in endoscopic examination within 3 months before the first administration, or evidence of portal hypertension (including splenomegaly found in imaging examination) was found. The researchers assessed that the risk of bleeding was high and did not receive sclerotherapy or ligation under the endoscope. 7. The previous 6-month history of arteriovenous thromboembolism, including myocardial infarction, unstable angina, cerebrovascular accident, pulmonary embolism, deep vein thrombosis or any other serious thromboembolism. The thrombus of implanted vein port or catheter source or superficial vein is stable after routine anticoagulant treatment. Prophylactic use of low-molecular-weight heparin (e.g., enoxaparin 40 mg / day) is permitted. 8. Tumor thrombus of main portal vein, or involving superior mesenteric vein at the same time. 9. Aspirin (\> 325 mg / day) or other drugs known to inhibit platelet function such as dipyridamole or clopidogrel were used for 7 consecutive days within 2 weeks before the first administration. 10. For uncontrolled hypertension, systolic blood pressure \> 150 mmHg or diastolic blood pressure \> 100 mmHg after the best medical treatment, hypertension crisis or hypertension encephalopathy history. 11. Symptomatic congestive heart failure (New York Heart Association class II-IV). Symptomatic or poorly controlled arrhythmias. The corrected QT interval (QTc) for the history or screening of congenital long QT syndrome was more than 500 ms (calculated by Fridericia method). 12. Serious bleeding tendency or coagulation dysfunction, or undergoing thrombolysis. 13. In the past 6 months, there was a history of gastrointestinal perforation and / or fistula, a history of intestinal obstruction (including incomplete intestinal obstruction requiring parenteral nutrition), extensive enterotomy (partial colectomy or extensive enterotomy with chronic diarrhea), Crohn's disease, ulcerative colitis or long-term chronic diarrhea. 14. Received radiotherapy within 3 weeks before the first administration. For patients who received radiotherapy three weeks before the first administration, all the following conditions must be met before entering the group: at present, there is no toxic reaction related to radiotherapy, no need to take glucocorticoids, excluding radiation pneumonia, radiation hepatitis, radiation enteritis, etc. 15. Previous and current pulmonary fibrosis history, interstitial pneumonia, pneumoconiosis, drug-related pneumonia, severe impairment of lung function and other lung diseases. 16. Active tuberculosis (TB), who is receiving anti TB treatment or has received anti TB treatment within one year before the first administration. 17. People with HIV infection (HIV 1 / 2 antibody positive) and known syphilis infection. Serious infection in active stage or poor clinical control. 18. Severe infection within 4 weeks before the first administration, including but not limited to hospitalization due to complications of infection, bacteremia or severe pneumonia. 19. Active autoimmune diseases requiring systemic treatment (such as the use of disease alleviation drugs, corticosteroids or immunosuppressants) occurred within 2 years before the first administration. Alternative therapies (e.g. thyroxine, insulin, or physiological corticosteroids for adrenal or pituitary insufficiency) are permitted. Known history of primary immunodeficiency. Only the patients with positive autoimmune antibody need to confirm whether there is autoimmune disease according to the judgment of researchers. 20. Immunosuppressive drugs were used within 4 weeks before the first administration, excluding local glucocorticoids or systemic glucocorticoids (i.e. no more than 10 Mg / day prednisone or the equivalent dose of other glucocorticoids), allowing temporary use of glucocorticoids due to dyspnea symptoms in the treatment of asthma, chronic obstructive pulmonary disease and other diseases. 21. Receive live attenuated vaccine within 4 weeks before the first administration or during the study period. 22. Major surgical procedures (craniotomy, thoracotomy or open hand) were performed within 4 weeks before the first administration (surgery) or an unhealed wound, ulcer, or fracture. 23. Received local treatment for liver cancer within 4 weeks before the first administration. 24. Chinese medicine with anti-tumor indications or drugs with immunomodulatory effects (including thymosin, interferon, interleukin, except for local use for control of pleural fluid or ascites) were received within 2 weeks before the first administration. 25. Uncontrolled / uncorrectable metabolic disorder or other non malignant organ disease or systemic disease or cancer secondary reaction, which may lead to higher medical risk and / or uncertainty of survival evaluation. 26. Known to be allergic to any PD-1 monoclonal antibody component. 27. Women of childbearing age who are unwilling or unable to use acceptable methods of contraception during the whole treatment period of this trial and within 12 weeks after the last administration of the study drug (women of childbearing age include: any women who have had menarche, and have not undergone successful artificial sterilization (hysterectomy, bilateral tubal ligation, or bilateral ovariectomy), pregnancy or lactation Women; women with positive pregnancy test results at the time of inclusion or before study drug administration; If the partner is a woman of childbearing age, the subject is a fertile male without effective contraceptive measures.