Risk of Hepatocellular Cancer in HCV Patients Treated with Direct Acting Antiviral Agents

Abstract Background and Aims The risk of hepatocellular cancer (HCC) after sustained virological response (SVR) with direct acting antivirals (DAA) is unclear. Our aim was to examine the risk and determinants of HCC in patients cured with DAA. Methods We conducted a retrospective cohort study of HCV patients who were treated with DAA in any of the 129 Veterans Health Administration hospitals between 1/1/2015 and 12/31/2015. We calculated the annual incidence rates for HCC by SVR. We used Cox regression models to compare the risk of HCC in patients with vs . those without SVR and to identify factors associated with incident HCC among patients with SVR. We reviewed a sample of HCC patients for tumor size and stage at diagnosis. Results Among 22,500 patients treated with DAA (19,518 with SVR; 2,982 without SVR), the mean (SD) age was 61.6 (6.1) year, and 39.0% had cirrhosis. There were 271 new cases of HCC, including 183 in patients with SVR. Compared to patients without SVR, those with SVR had a significantly reduced risk of HCC (0.90 vs. 3.45 HCC/100 PY; adjusted hazard ratio [HR], 0.28, 95% CI=0.22–0.36). Patients with cirrhosis had the highest annual incidence of HCC after SVR (1.82 vs. 0.34/100 PY in patients without cirrhosis; adjusted HR, 4.73. 95% CI, 3.34-6.68). Most (>44.8%) HCC were classified as stage I. Maximum size of the largest lesion was ≤5 cm in over 75% of cases. Conclusions Among patients treated with DAA, SVR was associated with a considerable reduction in the risk of HCC. We did not find any evidence to suggest that DAAs promote HCC. However, in patients with SVR, the absolute HCC risk remained high in patients with established cirrhosis. These patients should be considered for ongoing HCC surveillance.