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- Announced topline results from a Phase 3 clinical trial (Study GS-US-334-0118) in Japan evaluating the once-daily nucleotide analog polymerase inhibitor sofosbuvir in combination with ribavirin (RBV) for the treatment of genotype 2 chronic hepatitis C virus (HCV) infection. The study met its primary efficacy endpoint of superiority compared to a predefined historical control sustained virologic response (SVR) rate. In the study, 97 percent (n=148/153) of genotype 2 HCV-infected patients receiving 12 weeks of an all-oral regimen of sofosbuvir plus RBV achieved a sustained virologic response 12 weeks after completing therapy (SVR12). SVR12 rates among treatment-nave and treatment-experienced patients were 98 percent (n=88/90) and 95 percent (n=60/63), respectively. Of the 153 patients who received treatment, 11 percent (n=17) had documented cirrhosis. 

- Japan has one of the highest rates of liver cancer of any industrialized country, and the majority of cases are due to chronic HCV infection. An estimated two million people in Japan are living with HCV infection, and approximately 20-30 percent have the genotype 2 strain of the virus. Current treatment options for genotype 2 HCV infection in Japan involve up to 48 weeks of therapy with pegylated interferon injections, which may not be suitable for certain patients. 

- In Study GS-US-334-0118, 153 patients (100%) became HCV undetectable by treatment Week 4 and remained undetectable through the remainder of the 12-week treatment period. Post-treatment relapse accounted for five virologic failures. There were no treatment discontinuations due to adverse events and all patients completed the 12 week post-treatment follow-up visit. The most common side effects observed in the study, consistent with the population and safety profile of RBV, included nasopharyngitis, anemia, headache, malaise and pruritis. Full study results will be presented at a future scientific meeting.