<Oral> arms of Zenith is not strictly all oral arms because the patients who do not meet the stopping criterion (most likely an UND at the ends of Week 2 AND Week 8 of dosing) continue to receive pegIFN/RBV for 24 weeks following 12 wks of TVR/222/RBV. More than 50% would not meet the criterion but they would be <rescued> by the 24 weeks of IFN/RBV. The SVR would be high because of the <rescue> protocol. The important quantity here besides the SVR is the exact fraction of treated who would be eligible for stopping at the end of week 12. Is it much less than 50% or just below 50%.