hepdart paper - data analysis, page-16

Which combo is the combo?
It's hard to know which combination will eventually win out. When you start adding multiple drugs to each other, there's bound to be side-effect issues that aren't a problem when they're used individually. Hepatitis C is a little less life-threatening than HIV, so the FDA will demand a cleaner side-effect profile than they have for cocktails that treat HIV.

And while finding the most potent combination is important, it's useful only if they complement each other's resistance issues; knocking the virus down to undetectable levels in 100% of the patients isn't particularly useful if the virus just rebounds once it mutates in a way to avoid the drugs' inhibitory properties