The market share leader in hepatitis C treatment is Gilead Sciences, a biotech Goliath that markets the pan-genotype therapy Sovaldi and the genotype 1 drug Harvoni, which is a combination of Sovaldi and the company's NS5A inhibitor ledipasvir. Last year, those two drugs racked up sales of $10.4 billion (yes, with a "b") treating just 140,000 patients.