Researchers for Duke University’s MURDOCK Study want to understand why 50 percent of people treated for hepatitis C never get better.

In the next six months, they could share some preliminary research results with the world.

MURDOCK Study investigators working on the Hepatitis C project are beginning to see genetic differences in the receptors, or entry points, for the virus, Dr. John McHutchison said Tuesday at the N.C. Research Campus.

The groundbreaking study will focus on four diseases including hepatitis C, a global killer that will become a growing problem in the United States as those infected in the 1960s, ’70s and ’80s begin to develop liver disease.

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(Like all medical studies, MURDOCK is an acronym, but it also acknowledges billionaire David Murdock, who is building the research campus. Murdock is the owner of Dole Food.)