Merck 4-week hep C regimen with Gilead's Sovaldi comes up short

Nov 9 (Reuters) - An attempt by Merck & Co to shorten hepatitis C treatment to just four weeks by adding Gilead Sciences Inc's huge selling Sovaldi to its own oral two-drug combination came nowhere near the desired efficacy due to a high rate of relapses, according to interim data from a midstage study.