“…Real world cohorts have confirmed SVR12 > 90% with this regimen, mainly for genotypes 1-4, following unsuccessful therapy with first generation NS5A inhibitors (65)(66)(67)(68) or unspecified NS5A inhibitors (69,70). However, a lower SVR12 (9/13, 69%) was reported for genotype 3 infected patients (subtypes not presented) with cirrhosis (71) . Regarding second generation NS5A inhibitor exposed individuals, lower SVR12 rates (83-86%) were reported in individuals with genotypes 1-3 previously exposed to sofosbuvir-velpatasvir, (72), but with no impact of this prior combination in other studies (SVR 94-100%) (73),(74) emphasising the need for further retreatment outcome datasets in sofosbuvir-velpatasvir exposed patients, including resistance data.…”