Chronic hepatitis C virus infection is a substantial health care burden worldwide and is the leading cause of liver transplant in adults. In patients with detectable hepatitis C virus RNA at the time of transplant, interferon-based therapies for hepatitis C virus were poorly tolerated with low virologic response rates. Although reinfection after transplant is inevitable, the recent advent of direct-acting antiviral agents has revolutionized treatment of hepatitis C virus in the pre-and posttransplant settings. These antiviral agents have been shown to have high-sustained virologic response rates, shorter courses of treatment, and decreased frequencies of adverse effects. Here, we review the current literature on the use of direct-acting agents for treatment of patients with hepatitis C virus before and after liver transplant.
Key words: HCV, Liver transplantation
IntroductionHepatitis C virus (HCV) is the most common indication for liver transplant in the United States and Europe. 1 However, patient survival for HCV has been historically the lowest of all indications for liver transplant. 2,3 The main reason for the poor outcome is related to viral recurrence that occurs uniformly and to recurrent liver disease that occurs in up to 30% of patients within 5 years after liver transplant. [4][5][6][7] The need for liver transplant has increased not only for decompensated liver disease but also for hepatocellular carcinoma and for the aging cohort of HCVinfected patients seeking medical care. 8 Achieving a sustained virologic response (SVR) with antiviral therapy is associated with improved clinical outcomes in liver transplant recipients, 7,9 and at present, the availability of direct-acting agents has dramatically transformed the treatment of HCV. Whereas antiviral therapy with interferon was associated with significant adverse effects, interferonfree therapy has been found to be safe, tolerable, and effective. 10 These direct-acting agents are classified according to their mode of action and differ in potency, barrier to resistance, dosing, and drug-drug interactions. 11 The treatment of HCV in liver transplant recipients can occur at different time points along the continuum of liver disease. Treatment may be initiated before liver transplant in patients with compensated or decompensated cirrhosis, immediately after transplant, or after when disease reoccurs after transplant. Here, we review the use of antiviral therapies both in patients who are candidates for liver transplant and in recipients after liver transplant.
PretransplantAchieving an SVR has clearly been associated with improved clinical outcomes in patients with advanced liver disease. 12 Liver-related mortality, need for liver transplant, hepatocellular carcinoma, and hepatic decompensation are all decreased with an SVR. [13][14][15][16] Moreover, achieving an SVR before liver transplant reduces risk of graft reinfection after transplant. 17 Although the likelihood of achieving an SVR is greatly enhanced with the use of interferonfree regime...