GS-9451 is a potent macrocyclic HCV NS3 PI that achieved a median maximal change in HCV RNA of 3.6 log10 IU/mL (range, -4.7 log10 to -3.1 log10 IU/mL) following 3-day monotherapy in treatment-naïve patients with HCV genotype 1 infection during phase I. In multiple GT1a and GT1b replicon cell lines, GS-9451 had mean 50% effective concentrations (EC50s) of 13 and 5.4 nM, respectively, with minimal cytotoxicity; similar potency was observed in chimeric replicons encoding the NS3 protease gene of GT1 clinical isolates. GS-9451 was less active in GT2a replicon cells (EC50 = 316 nM). GS-9451 showed good oral bioavailability in all three species tested.
|Body Surface Area (m2)||0.007||0.025||0.15||0.05||0.02||0.5|
|Animal A (mg/kg) = Animal B (mg/kg) multiplied by||Animal B Km|
|Animal A Km|
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
Preclinical characterization of the novel hepatitis C virus NS3 protease inhibitor GS-9451.
Yang H, et al. Antimicrob Agents Chemother. 2014;58(2):647-53. PMID: 23939899.
Characterization of resistance to the protease inhibitor GS-9451 in hepatitis C virus-infected patients.
Dvory-Sobol H, et al. Antimicrob Agents Chemother. 2012 Oct;56(10):5289-95. PMID: 22869562.
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