The suggestion that longer 24-week dosing might improve Sofo/Riba GT3 SVR rates is non-sense. The difference between interferon-based and oral therapy is becoming quite clear. Whereas 24-weeks of interferon-based dosing brought exceedingly higher SVR rates this is not the case going beyond 12-weeks of oral treatment.
This is nothing more than false hope being fed to analysts.
Note that in that phase II of sofosbuvir + daclatasvir w/wo ribavirin treatment duration was 24 weeks in GT2/3 and perhaps there were other differences like cirrhotic patients.