A Phase II Study of Subcutaneously Injected PD-L1 Antibody ASC22 in Chronic Hepatitis B Patients

Inclusion Criteria: 1. 18-65 years old (including boundary value), gender unlimited； 2. Chronic hepatitis B patients with clear diagnosis of Hematology, etiology and clinical (for example: HBsAg positive for more than 6 months); 3. HBV-DNA turns negative after treatment with nucleoside (acid) drugs; 4. cohort1-5:HBsAg≤ 10000 IU/mL; cohort6: HBsAg≤ 100 IU/mL; 5. HBeAg negative; 6. The fertile female subjects or the fertile male subjects agreed to take contraceptive measures from 7 days before the first administration until 24 weeks after the end of the administration cycle of ASC22. The serum pregnancy test of fertile female subjects must be negative within 7 days before the first administration. Exclusion Criteria: 1. Patients with hepatitis a, hepatitis c (HCV RNA\>15IU/L), hepatitis d or HIV infection; Patients with other active infections (e.g., respiratory tract infection, urinary tract infection and herpes simplex, cytomegalovirus, epstein-barr virus); 2. Fibrosis stage: Cirrhosis, portal hypertension, or advanced fibrosis (defined as Fibroscan≥9.5kPa or ARFI≥1.81m/sec or Fibrosis-4 (FIB-4)≥3.25 or METAVIR F≥3); 3. Liver cancer patients or blood AFP\>1×ULN; 4. cohort1-5：Patients who received interferon therapy within 6 months before the first administration; cohort6: Patients who received interferon therapy before the first administration; 5. Patients receiving immunosuppressive therapy within 3 months before the first administration (except interferon); 6. The investigator judges that the participants are not suitable for this study.