The PI’s shown on ACHN’s webcast slide were Telaprevir, Boceprevir, ITMN-191, and TMC435. The other PI’s mentioned in the “HCV: Most Likely to Succeed” post that are clearly ahead of ACH-1625 are: • BI’s BI 201335: #msg-42086185, #msg-33564560; • MRK’s Narlaprevir (f/k/a/ SCH 900518): #msg-43169835, #msg-34338549; • MRK’s MK-7009: #msg-34337398, #msg-34335327. The PI’s listed in the “Most Likely to Succeed” post that are behind ACH-1625 or are at roughly the same stage of development are: • BMY’s BMS-650032: #msg-40361108; • ABT’s ABT-450 #msg-35708745; • GILD’s GS9256: #msg-42717806; • IDIX’s IDX316 #msg-34337398, #msg-34335327. I’m not including VRTX’s VX-813 and VX-985 in the above list because I don’t think these programs are genuinely active (#msg-42917596). p.s. That makes 12 PI's in all (14 if you count VX-813/VX-985). No matter how you slice it, it's a crowded arena.