This is a multicenter, single-arm, open-label, phase IIIb extension clinical trial designed to evaluate the long-term safety and tolerability of GST-HG141 (nerlecovir, 50 mg BID) in combination with nucleos(t)ide analogues (NAs) in patients with chronic hepatitis B (CHB) who completed 48 weeks of treatment in the phase III study (GST-HG141-III-01), did not discontinue prematurely, had an overall medication compliance rate of ≥80%, and were willing to continue treatment.
A maximum of 578 eligible participants will be enrolled at 64 centers, including those who completed the preceding study, had ALT ≤5× upper limit of normal (ULN), and had no severe comorbidities (e.g., decompensated cirrhosis, other viral infections, or malignant tumors)
Participants who received the study treatment of the phase III clinical trial of GST-HG141 (GST-HG141-III-01) in accordance with the protocol requirements (participants without early withdrawal and with overall medication compliance ≥ 80%), and had ALT ≤ 5×ULN;
Participants were willing to participate in the study and were judged by the investigator to be suitable for long-term treatment with GST-HG141 combined with NAs;
Male participants with female partners of childbearing potential or female participants of childbearing potential voluntarily adopted effective contraceptive measures from screening to 28 days after study withdrawal ;
Signed the informed consent form prior to the trial and were able to complete the study in accordance with the requirements of the trial protocol.
Presence of severe systemic infection requiring treatment;
Suffering from clinically significant acute or chronic liver diseases not caused by HBV infection;
Participants with a history of liver cirrhosis; or currently diagnosed or suspected decompensated liver cirrhosis, including but not limited to hepatic encephalopathy, hepatorenal syndrome, esophagogastric variceal bleeding, splenomegaly, ascites, etc.; or participants with significant progression of liver fibrosis;
Primary liver cancer; suspected malignant space-occupying liver lesions suggested by imaging examination; combined with other malignant tumors (except cured basal cell carcinoma or squamous cell carcinoma of the skin and carcinoma in situ of the cervix);
Single group
GST-HG141
DrugGST-HG141 50 mg BID + NAs
To evaluate the safety of GST-HG141 combined with NAs treatment
Treatment-emergent AE incidence rate
The percentage of participants in the experimental group of Study GST-HG141-III-01 with HBV DNA < 20 IU/mL after completing this study and receiving 48 weeks of GST-HG141 combined with NAs treatment.
Among participants of Study GST-HG141-III-01 who had HBV DNA ≥ 20 IU/mL after completing double-blind treatment, the percentage of participants with serum HBV DNA < 20 IU/mL following 48 weeks of treatment in this study.
The percentage of participants with serum HBV DNA < 20 IU/mL at each visit time point.
The percentage of participants with serum HBV DNA < 10 IU/mL at each visit time point.
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