An interferon-free regimen containing Merck's grazoprevir, the NS5A inhibitors elbasvir or MK8404, and the experimental nucleotide polymerase inhibitor MK-3682, taken for 8 weeks, cured more than 90% of non-cirrhotic hepatitis C patients with HCV genotypes 1, 2, or 3, according to late-breaking research presented at the AASLD Liver Meeting in November.