Background
In the United States, genotype 2 accounts for approximately 13 to 15% of all hepatitis C virus (HCV) infections.[1] In the era before direct-acting antiviral agents (DAAs), sustained virologic response rates at 12 weeks post-treatment (SVR12) were relatively higher in persons with genotype 2 HCV than those with genotype 1, 3, or 4 HCV. Thus, data regarding retreatment of individuals with genotype 2 in whom prior therapy failed are limited. The following discussion regarding initial treatment and retreatment of persons with genotype 2 chronic HCV assumes the individual and their clinician have already made the decision to proceed with hepatitis C therapy. This topic review does not address the treatment of HCV genotype 2 in persons with decompensated cirrhosis, severe renal impairment (or end-stage renal disease), or post-liver transplantation.
Medications Used to Treat HCV Genotype 2
The HCV Medications section on this website provides detailed information for each of the Food and Drug Administration (FDA)-approved medications listed in the treatment recommendations, including links to the full prescribing information and to patient assistance programs. The direct-acting antiviral agents exert their action at specific steps in the HCV life cycle. There are three major classes of direct-acting antiviral medications: (1) nonstructural proteins 3/4A (NS3/4A) protease inhibitors, (2) NS5A inhibitors, and (3) NS5B polymerase inhibitors (Figure 1); the NS5B polymerase inhibitors include the nucleoside analogs and nonnucleoside analogs.[2,3] Adherence with the treatment regimen is of paramount importance. Accordingly, patients should receive detailed counseling regarding the importance of adherence prior to starting therapy and clinicians should provide intensive follow-up during therapy.
Approach to Choosing HCV Genotype 2 Treatment Regimen
For patients chronically infected with genotype 2 HCV, two key factors influence the choice and duration of therapy: cirrhosis status and prior treatment experience. In addition, the cost of the regimen, insurance coverage, concurrent medications, and patient and provider preference can play a major role in the regimen choice. The following treatment recommendations are based on the AASLD-IDSA HCV Guidance for initial treatment of adults with HCV genotype 2 and for retreatment of adults in whom prior therapy failed, including those with HCV genotype 2.[4,5]