Ardea Biosciences Identifies Lead Development Candidate for Gou... (ve tissue of the joints and in thekidney...)

Ardea Biosciences Identifies Lead Development Candidate for Gout, RDEA594

Date:5/19/2008

ve tissue of the joints and in the kidneys, leading to inflammation, the formation of disfiguring nodules (tophi), intermittent attacks of severe pain (acute flares), and kidney damage (nephropathy). While gout is a treatable condition, there are limited treatment options, and a number of adverse effects are associated with current therapies. No new therapies have been approved by the FDA for the treatment of hyperuricemia associated with gout in the past 40 years.

About RDEA594

RDEA594 is a development candidate that has potential for treating gout patients with hyperuricemia. RDEA594 is a metabolite of RDEA806, a non-nucleoside reverse transcriptase inhibitor (NNRTI) in development for the treatment of HIV. In Phase 1 studies with RDEA806 in healthy volunteers, increased urinary excretion of uric acid was observed in the first 24 hours after dosing, with statistically significant, exposure-dependent, decreases in serum uric acid of 35% to 50% observed following 10-14 days of dosing. RDEA594 exhibits a concentration-dependent inhibitory effect on the URAT1-mediated uptake of uric acid ex vivo and is believed to be the active moiety responsible for the uric acid-lowering effects of RDEA806. Approximately 90% of hyperuricemic patients are considered to be under-excretors of uric acid, so increasing excretion may provide the most physiologically appropriate treatment. RDEA594 does not have significant antiviral activity.

About Ardea Biosciences

Ardea Biosciences, Inc., of San Diego, California, is a biotechnology company focused on the discovery and development of small-molecule therapeutics for the treatment of HIV, cancer and inflammatory diseases, including gout. We have four drug candidates in clinical trials and others in preclinical development and discovery. Our most advanced development candidate is RDEA806, a non-nucleoside reverse transcriptase inhibitor (NNRTI), which is in a Phase 2a study for the treatment of HIV. We have evalu
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