Anti-Nuclear Cytoplasmic Antibody-Associated Vasculitis: A Probable Adverse Effect of Sofosbuvir Treatment in Chronic Hepatitis C Patients.

Background: Egypt has the largest hepatitis C virus (HCV) epidemic worldwide. Sofosbuvir is an antiviral drug acting by inhibition of the HCV NS5B polymerase. It has shown high efficacy in combination with several other drugs and has a low reported rate of side effects. Objective: The aim of this prospective cohort study was to assess the safety of sofosbuvir-based treatment regimens used to treat chronic hepatitis C infections and to detect any side effects of sofosbuvir not previously reported. Methods: We studied treatment side effects in 3,000 patients with chronic HCV infection treated with sofosbuvir and ribavirin for 24 weeks or treated by pegylated interferon, sofosbuvir, and ribavirin triple therapy for 12 weeks. The endpoint of the study was the end of treatment. Results: Hyperbilirubinemia occurred frequently during treatment in both groups. Treatment was discontinued in 72 cases due to hepatic decompensation and drug complications; 8 of the cases had deep vein thrombosis (DVT) and 7 had cerebral ischemia. Surprisingly, 177/3,000 (5.9%) patients presented with abnormal bleeding, 85 of whom had a vasculitic skin rash. Conclusion: We report the occurrence of previously nonrecorded side effects with sofosbuvir, namely DVT and bleeding disorders associated with anti-nuclear cytoplasmic antibody (ANCA)-associated vasculitis (AAV).We believe this to be the first report of sofosbuvir-induced AAV skin lesions and bleeding disorders.