Study of AHB-171 in Chronic Hepatitis B Participants

Prior treatment

• Prior history of solid organ or hematopoietic stem cell transplantation.
• Imaging or histological evidence of significant liver fibrosis or cirrhosis within 12 months prior to screening, or a liver stiffness measurement indicative of significant fibrosis or cirrhosis at screening. Major trauma or major surgery within 12 weeks prior to screening
• Severe infection requiring intravenous anti-infective therapy within 2 weeks prior to screening (excluding chronic HBV infection).
• Blood donation or blood loss exceeding the specified volume within 12 weeks prior to screening, or planned blood donation during the trial period.
• Use of immunosuppressants, immunomodulators, cytotoxic drugs, or biologics within 6 months prior to screening.
• Use of any oligonucleotide drugs or interferon therapy within 12 months prior to screening.
• Vaccination within 4 weeks prior to screening, or planned vaccination during the trial period.
• Currently participating in another clinical trials, or within the washout period.

Other illness

• History of any severe systemic disease or malignancy other than chronic HBV infection which, in the opinion of the investigator, makes the subject unsuitable for study participation.
• History of any other liver disease that the investigator considers unsuitable for trial.History of autoimmune disease or diseases with potential immune activation risk.
• History of primary liver cancer, or diagnosis/suspected liver cancer at screening.
• History of severe allergies (e.g., to ≥2 allergens) or severe allergy to any component of the study drug, or in the opinion of the investigator, makes the subject unsuitable for participation.
• History of drug abuse, or alcoholism.
• Presence of tattoos, active skin diseases, or other conditions that may interfere with subcutaneous drug administration or observation of injection site reactions.
• Tested positive for HIV，HCV or active syphilis infection.
• Uncontrolled hypertension at screening.
• Any other condition or factor which, in the opinion of the investigator, makes the subject unsuitable for trial participation.

Lab values

• Clinically significant abnormal laboratory test as specified in protocol at screening.

Other

• History or presence of hepatic decompensation at screening.
• Clinically significant abnormal electrocardiogram (ECG) at screening.

• Able to fully understand and sign the informed consent form (ICF).
• Male or female participants, aged 18-65 years (inclusive).
• Body mass index (BMI) meeting the predefined eligibility range.
• Chronic hepatitis B (CHB) participants with HBsAg or HBV DNA positivity for ≥6 months at screening.
• At screening, participants meeting predefined ranges of HBsAg, HBV DNA, and ALT according to prior nucleos(t)ide analogue (NA) treatment history (stable prior treatment or treatment-naive), and meeting corresponding prior antiviral treatment duration requirements.
• Adopt effective contraceptive measures as required