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Background and Aims: JNJ-6379 is a potent and selective HBV replication inhibitor with a dual mode of action, inhibiting both early and late steps of the viral life cycle. This study aims to evaluate safety, pharmacokinetics and antiviral activity of multiple ascending doses of JNJ-6379 in CHB patients.
Method: Treatment-naïve, HBeAg-positive or -negative CHB patients, with plasma HBV DNA >2000 IU/mL, METAVIR <F3 and ALT/AST <2.5 the upper limit of normal, were enrolled into this ongoing, randomized, double-blind, placebo-controlled Phase 1b study. Patients were randomized in a 3:1 ratio to receive JNJ-6379 or placebo for 28 days with 8 weeks follow-up. To date, 3 groups have been evaluated (25 mg QD [after 100 mg loading dose], 75 mg QD and 150 mg QD). Evaluation of a fourth group (250 mg QD) is ongoing.
Results: Across all groups (n = 36), median agewas 42.5 years (range: 21–58), 83% males, 78% Caucasian, 11% Asian, 6% Black/African American, 6% other/not reported. 25% of patients were HBeAgpositive. At Day 29, substantial reductions from baseline in HBV DNA (Table) and HBV RNA were observed in all 3 treatment groups. No notable changes in HBsAg were observed. Adverse events (AEs) or laboratory abnormalities ≥Grade 3 were infrequent (≤3 patients/dose); 64% (23/36) experienced ≥1 AE on treatment (25 mg, n = 9/12; 75 mg, n = 6/12; 150 mg, n = 8/12). There was one serious AE (right frontal lobe mass, unrelated to study drug), one discontinuation due to AEs (isolated ALT/AST flare with no bilirubin elevation, likely related to study drug), and no dose-limiting toxicities. After repeated administration, drug exposure increased in a dose-dependent manner. Apparent drug clearance was low, and similar across groups and ethnicities.
Conclusion: JNJ-6379 administered for 28 days was generally well tolerated and resulted in potent antiviral activity at all doses evaluated, and the data from this study warrants additional evaluation of the compound in phase 2a. |
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