Phase-2 data on Sovaldi + GS-5816 show why only 12w regimens were advanced to phase-3 by GILD: http://finance.yahoo.com/news/gilead-announces-phase-2-data-130000472.html The results…presented at the Liver Meeting this week (Oral #80), evaluated eight weeks of SOF plus GS-5816, with and without RBV, in patients with genotype 1 or 2 HCV infection. Among genotype 1 patients receiving SOF plus GS-5816 100 mg, SVR12 rates were 81 percent (n=25/31) and 90 percent (n=26/29), with and without RBV, respectively. 81-90% SVR12 isn’t good enough anymore. In short, Sovaldi + GS-5816 will be an improvement relative to Harvoni only for GT3 patients. See cheat sheet in #msg-104733739 for the Sovaldi + GS-5816 phase-3 program.