NEW YORK (GenomeWeb) – As it presses ahead with Phase II development of its flagship hepatitis B therapy ARC-520, Arrowhead Research is banking on the drug's ability to cut levels of the virus's surface antigen (s-antigen), a key indicator of active infection, the company's top executive said this week.

According to Arrowhead President and CEO Chris Anzalone, treating HBV has proven especially challenging because blocking viral replication alone is not enough to clear the virus, unlike with hepatitis C.

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