Three percent and five percent of patients discontinued treatment due to adverse events in the pre- and post-transplant studies, respectively. No serious adverse events reported were associated with sofosbuvir. The most common adverse events observed were consistent with the safety profile of RBV, and included fatigue, anemia, headache and nausea in the pre-transplant study, and fatigue, headache, arthralgia (joint pain) and diarrhea in the post-transplant study.About the Pre-Transplant Study Study 2025 is an on-going open-label Phase 2 study evaluating the efficacy and safety of sofosbuvir (SOF) 400 mg once daily plus weight-based ribavirin (RBV) for up to 48 weeks or until liver transplantation. Sixty-one patients with HCV infection (Child-Pugh class A or B cirrhosis) and liver cancer, who were either treatment-naïve or treatment-experienced were enrolled. About the Post-Transplant Study Study 0126 is an ongoing open-label Phase 2 study evaluating the efficacy and safety of 24 weeks of treatment with sofosbuvir 400 mg once-daily plus RBV (starting at 400 mg/day) among 40 treatment-naïve and treatment-experienced patients with recurrent HCV infection. Patients in the study had received a transplant a median of four years prior to the study, and 40 percent were cirrhotic. There were no deaths, graft losses or episodes of organ rejection among post-liver transplantation patients in the study. Additional information about these studies can be found at www.clinicaltrials.gov. Sofosbuvir is an investigational product and its safety and efficacy have not been established. About Gilead Sciences Gilead Sciences is a biopharmaceutical company that discovers, develops and commercializes innovative therapeutics in areas of unmet medical need. The company’s mission is to advance the care of patients suffering from life-threatening diseases worldwide. Headquartered in Foster City, California, Gilead has operations in North and South America, Europe and Asia Pacific.