Patients with the rs12979860 CC genotype and hepatitis C infection may have higher response rates (SVR) to triple therapy (telaprevir, peginterferon alfa-2a/b and ribavirin) as compared to patients with the CT or TT genotype. However, conflicting evidence has been reported. The impact of IL28B genotype may be dampened in patients with prior PegIFN/RBV treatment failure. Other genetic and clinical factors may also influence response to HCV triple therapy.