For example, instead of having 15% chance of cure with
pegasys alone, one could have maybe 20% (or 25%) chances of cure if
pegasys would be combined with 520.
Pegasys can cause substantial side effects though...pegasys + 520 could be even tougher on side effects....so the question is how much one would be willing to take a risk to get to a cure.
Above is just my own estimate (based also on consultation with studyforhope, and the fact that 520 can lower hbsag just by 0.