SOF/VEL/VOX results in high SVR12 rates when administered for 12 weeks in DAA-experienced patients or for 8 weeks in DAA-naive patients: An integrated analysis of the POLARIS-1 POLARIS-2, POLARIS-3 and POLARIS-4 studies.

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Background The once-daily fixed-dose combination tablet of sofosbuvir/velpatasvir/voxilaprevir(SOF/VEL/VOX) was evaluated for the treatment of genotype 1-6 HCV infection in four Phase 3 studies in direct-acting antiviral (DAA)-experienced (POLARIS-1 and POLARIS-4) and DAA-naïve (POLARIS-2 and POLARIS-3) patients with and without compensated cirrhosis. DAA-experienced patients received treatment for 12 weeks, and DAA-naive patients received treatment for 8 weeks. Overall SVR12 rates were >95% across all the studies. This post-hoc analysis assesses efficacy in patients with and without traditional negative predictors of response. Methods This was a retrospective analysis of data from 1056 patients treated with SOF/VEL/VOX in the Phase 3 studies. Presence of cirrhosis was determined by histology, Fibrotest/APRI, or Fibroscan. Viral load and other clinical and laboratory assessments were determined prior to treatment with SOF/VEL/VOX. Prior treatment records were source verified and race was self-reported by the patient to the investigator. Results Overall, 38% of patients had cirrhosis, 70% had HCV RNA 800,000 IU/mL, 59% of the DAA-experienced patients had received an NS5A inhibitor-containing regimen, 20% of the DAA-naive patients had prior treatment failure with pegylated interferon +ribavirin, 12% were 65 years old and 10% were black. Conclusions The POLARIS-1, POLARIS-2, POLARIS-3, and POLARIS-4 studies enrolled a diverse patient population that included a significant number of patients with historically negative predictors of response including cirrhosis and prior exposure to DAA-containing regimens. High SVR12 rates for the ribavirin-free regimen of SOF/VEL/VOX were achieved across subgroups.



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