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Keryx Biopharmaceuticals Reports Positive Phase 2 Study Results of Zerenex (Ferric Citrate) for the Treatment of Hyperphosphatemia in End-Stage Renal Disease Patients
Date:6/8/2009

NEW YORK, June 8 /PRNewswire-FirstCall/ -- Keryx Biopharmaceuticals, Inc. (Nasdaq: KERX) today announced results of the Phase 2 study of Zerenex (ferric citrate) for the treatment of elevated serum phosphorous levels, or hyperphosphatemia, in patients with end-stage renal disease (ESRD) on thrice weekly hemodialysis. The study was a multicenter, open-label clinical trial, which enrolled 55 patients. The primary objective of this study was to assess the tolerability and safety of Zerenex (ferric citrate) with doses ranging from approximately 1 gram per day to 12 grams per day.

The top line efficacy and safety results from this Phase 2 study were submitted to the FDA, and discussed at a recent face to face meeting with the Division of Cardiovascular and Renal Drug Products. The FDA also reviewed the final reports for the 90-day rat and 16-week canine toxicology studies. The FDA indicated that the results of the Phase 2 study and the toxicology studies were adequate to support entry into a Phase 3 program. Keryx is in the process of finalizing the Phase 3 program in consultation with the FDA.

The FDA also reviewed the protocols for the ongoing chronic toxicology studies (6-month rat and 42-week canine), which can be completed after the Phase 3 program has begun.

In the first part of the Phase 2 study, 34 ESRD patients who were taking approximately 6 to 15 tablets/capsules per day of calcium acetate, calcium carbonate, lanthanum carbonate or sevelamer hydrochloride or any combination of these agents were eligible for enrollment and immediately switched to a starting dose of 4.5 grams per day of Zerenex (ferric citrate). In the second part of the study, 21 ESRD patients who were taking > 12 tablets/capsules per day of calcium acetate, calcium carbonate, lanthanum carbonate or sevelamer hydrochloride or an
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SOURCE Keryx Biopharmaceuticals, Inc.
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