EASL - Gilead Announces Results from Study of Sovaldi® for Retreatment of Chronic Hepatitis C

Gilead Announces Results from Study of Sovaldi® for Retreatment of Chronic Hepatitis C in Patients Not Cured with Prior Antiviral Therapy 

LONDON --(Business Wire)--

Gilead Sciences, Inc. (Nasdaq: GILD) today announced results from an open-label clinical trial (Study GS-US-334-0109) evaluating once-daily Sovaldi® (sofosbuvir) 400 mg tablets for the retreatment of chronic hepatitis C virus (HCV) infection among patients who failed prior therapy. These data will be presented in two oral sessions at the 49th Annual Meeting of the European Association for the Study of the Liver (The International Liver Congress 2014) in London.

In Study GS-US-334-0109 (Oral #55), patients with genotype 1 HCV infection (n=80) received 12 weeks of treatment with once-daily Sovaldi plus weight-based ribavirin (RBV) twice-daily (1,000 or 1,200 mg/day) and pegylated interferon (peg-IFN; 180g/week). Patients in the study had failed prior regimens containing peg-IFN, RBV and an investigational NS3 protease inhibitor, with or without investigational direct-acting antivirals (DAAs) (NS5A and/or non-nucleoside NS5B inhibitors). Forty-five percent of patients (n=36) had received more than one course of prior therapy, and 90 percent (n=72) had at least one viral mutation associated with HCV NS3, NS5A or NS5B drug resistance.

Among the 50 patients for whom sustained virologic response data was available 12 weeks after the end of treatment (SVR12), 74 percent (n=37/50) achieved SVR12. Additionally, 80 percent (n=28/35) of patients with baseline resistance against two or more DAAs achieved SVR12.

"This study demonstrates that Sovaldi-based regimens can achieve high cure rates even among hepatitis C patients who previously failed therapy with baseline resistance to at least two DAAs," said Stanislas Pol, MD, PhD, Professor of Hepatology and Gastroenterology, Paris Descartes (News - Alert) University, Paris, France, and a principal investigator. "Importantly, Sovaldi has now demonstrated efficacy among genotype 1 HCV infected patients who failed prior treatment with three or four drug regimens and have developed viral resistance to some of the components of those regimens."

In a separate presentation (Oral #8), retreatment with Sovaldi in genotype 2 (n=11) or genotype 3 (n=96) HCV infected patients who previously failed treatment with 12 or 16 weeks of Sovaldi plus RBV in the Phase 3 studies FISSION, FUSION and POSITRON was evaluated. Thirty-six percent of these patients (39/107) had cirrhosis. Patients were retreated either with a 12-week regimen of Sovaldi, RBV and peg-IFN, or a 24-week, interferon-free regimen of Sovaldi plus RBV. The choice of regimen was determined by study investigators.

Among patients with available SVR12 data, 63 percent (n=25/40) of those who received the 24-week all-oral regimen and 92 percent (n=24/26) of those who received the 12-week regimen of Sovaldi, RBV, and peg-IFN achieved SVR12.

"These data support initial findings from the Phase 3 trials, which demonstrate that Sovaldi is an effective treatment option and one that may also be particularly important for genotype 2 and 3 patients who failed a previous sofosbuvir-based regimen," said Rafael Esteban, MD, Head of the Internal Medicine and Liver Unit, Hospital Universitari Vall d'Hebron and Professor of Medicine, Universitat Autnoma de Barcelona, Barcelona, Spain and a principal investigator for the study

Sovaldi was well tolerated in Study GS-US-334-0109. The most common adverse events were consistent with the safety profiles of peg-IFN and/or RBV. Additional information about the study can be found at www.clinicaltrials.gov.

About Sovaldi

Sovaldi is an oral nucleotide analog inhibitor of the HCV NS5B polymerase enzyme, which plays an essential role in HCV replication. Sovaldi is a direct-acting agent, meaning that it interferes directly with the HCV life cycle by suppressing viral replication.

Sovaldi was approved in the United States on December 8, 2013 and in the European Union on January 17. In the United States, Sovaldi is approved for the treatment of chronic hepatitis C infection as a component of a combination antiviral treatment regimen.

Efficacy has been established in subjects with HCV genotype 1, 2, 3 or 4 infection, including those with hepatocellular carcinoma meeting Milan criteria (awaiting liver transplantation) and those with HCV/HIV-1 co-infection. Treatment response varies based on baseline host and viral factors.

Monotherapy is not recommended for treatment of chronic hepatitis C. Study GS-US-334-0109 evaluated investigational uses of Sovaldi, for which safety and efficacy have not yet been established.