Abstract
Purpose
The aim of this study was to evaluate the effects of danoprevir in combination with low-dose ritonavir (danoprevir/r) and placebo plus low-dose ritonavir on the pharmacokinetics of probe drugs for cytochrome P450 (CYP) 3A and CYP2C9, in patients with chronic hepatitis C.
Methods
A total of 54 patients infected with hepatitis C virus genotype 1 received an oral drug cocktail (2 mg midazolam, 10 mg warfarin and 10 mg vitamin K) before and after 14 days of dosing with either danoprevir/r or placebo plus low-dose ritonavir (placebo/r). Serial pharmacokinetic samples were collected up to 24 (midazolam) and 72 (S-warfarin) h post-dose. Plasma concentrations of midazolam, α-hydroxymidazolam and S-warfarin were measured using validated assays. Pharmacokinetic parameters were estimated using non-compartmental analysis, and geometric mean ratios (GMRs) and 90 % confidence intervals (CIs) for the differences between baseline and post-dosing values were calculated.
Results
Danoprevir/r and placebo/r significantly increased midazolam area under the time–concentration curve (AUC0–∞) and reduced the midazolam metabolic ratio while S-warfarin AUC0–∞ was modestly decreased. When danoprevir data were pooled across doses, the midazolam GMR (90 % CI) AUC0–∞ was 9.41 (8.11, 10.9) and 11.14 (9.42, 13.2) following danoprevir/r and placebo/r dosing, respectively, and the S-warfarin GMR (90 % CI) AUC0–∞ was 0.72 (0.68, 0.76) and 0.76 (0.69, 0.85), respectively. The effects of danoprevir/r and placebo/r appeared to be qualitatively similar.
Conclusions
Substantial inhibition of CYP3A- and modest induction of CYP2C9- activity were observed with danoprevir/r and low-dose ritonavir.
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Acknowledgements
We would like to thank the patients, their families, the nurses, and the investigators who participated in this study. This work was supported by F. Hoffmann-La Roche Ltd..
Declaration of interest
This work was supported by F. Hoffmann-La Roche Ltd.. Support for third-party writing assistance for this manuscript was provided by F. Hoffmann-La Roche Ltd. PNM, MG, NS, BJB are current employees at Roche/Genentech. LC, RK, JQT and PFS were employees at Hoffmann-La Roche Inc at the time of the study.
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L. Chang, Y. Zhang, P. Weigl, N. Shulman, P. Smith, J Tran: Danoprevir does not change the effects of ritonavir on the pharmacokinetics of cytochrome P450 3A substrate midazolam and C29 substrate warfarin. Presented at the 112th Annual Meeting of the American Society Clinical Pharmacology Therapeutics (ASCPT), Dallas, Texas, March 2–5, 2011. Poster PIII-77
This study is registered on ClinicalTrials.gov (NCT01185860)
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Morcos, P.N., Chang, L., Kulkarni, R. et al. A randomised study of the effect of danoprevir/ritonavir or ritonavir on substrates of cytochrome P450 (CYP) 3A and 2C9 in chronic hepatitis C patients using a drug cocktail. Eur J Clin Pharmacol 69, 1939–1949 (2013). https://doi.org/10.1007/s00228-013-1556-y
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DOI: https://doi.org/10.1007/s00228-013-1556-y