Anadys Pharmaceuticals Presents Preclinical Results on ANA598, a Non-Nucleoside Inhibitor of the NS5B Polymerase, at the 14th International Symposium on Hepatitis C Virus and Relat...( ANA598 demonstrates favorable p...),Health

ANA598 demonstrates favorable preclinical antiviral, metabolic,

pharmacokinetic and preliminary toxicologic properties

SAN DIEGO, Sept. 11 /PRNewswire-FirstCall/ -- Anadys Pharmaceuticals, Inc. (Nasdaq: ANDS) presented preclinical data today on ANA598, a non-nucleoside inhibitor of the HCV NS5B polymerase, during a poster session at the 14th International Symposium on Hepatitis C Virus and Related Viruses.

The report characterized the favorable antiviral, metabolic, pharmacokinetic and preliminary toxicologic properties that supported the decision announced in June to progress ANA598 to IND enabling studies and subsequent clinical evaluation expected to commence in the first half of 2008. ANA598 is a potent, low-nanomolar inhibitor of HCV genotype 1a and 1b replicons and has exhibited good metabolic stability properties in in vitro preclinical studies. It also does not significantly inhibit or induce cytochrome enzymes, indicating that the compound has a low likelihood of producing clinical drug-drug interactions. ANA598 was well tolerated in 14-day dose range finding (DRF) animal toxicology studies at all doses tested (1 to 1000mg/kg). In in vivo preclinical studies designed to be predictive of potential human doses, trough plasma concentrations of ANA598 24 hours post dosing exceeded the EC95 for HCV genotype 1a and 1b replicon inhibition at doses corresponding to estimated human doses. The EC95 is the concentration required to suppress hepatitis C viral RNA levels by 95% in the replicon assay.

"We are pleased with the ANA598 plasma exposures we have observed in animal studies at doses that were well tolerated for 14 days," said Steve Worland, Ph.D., President and Chief Executive Of
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