The pharmacokinetics of peginterferon alfa-2a and ribavirin in African American, Hispanic and Caucasian patients with chronic hepatitis C
Alimentary Pharmacology and Therapeutics,  Clinical Article

Brennan BJ et al. – No differences were observed in peginterferon alfa–2a (PEG–IFN alfa–2a) pharmacokinetic parameters between African American or Hispanic patients compared with Caucasian patients. For ribavirin, no differences were observed in pharmacokinetic parameters between Hispanic and Caucasian patients. While a trend towards increased ribavirin clearance and decreased exposure was observed in African American patients vs. Caucasian patients, the differences were small and not considered clinically meaningful.

Methods
  • Forty-seven patients with genotype 1 CHC (17 African Americans, 14 Hispanics and 16 Caucasians) received 8 weeks of PEG-IFN alfa-2a (180 &g/week) and ribavirin (1000 or 1200 mg/day).
  • PEG-IFN alfa-2a serum concentrations and ribavirin plasma concentrations were measured following the first dose and at week 8.
  • Pharmacokinetic parameters (Cmax, Tmax, AUC, CL/F) were estimated using noncompartmental methods.

Results
  • There was no difference in the pharmacokinetic parameters for PEG-IFN alfa-2a following single-dose or steady-state administration between African American or Hispanic patients compared with Caucasian patients.
  • Ribavirin pharmacokinetic parameters were similar between Hispanic and Caucasian patients for single-dose and steady-state administration.
  • The single-dose Cmax was 33% lower (P < 0.05) in African American compared with Caucasian patients.
  • Other ribavirin single-dose and steady-state pharmacokinetic parameters were slightly decreased (approximately 20% lower) in African American patients, but were not considered clinically meaningful.

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