Date:12/16/2009

. The Phase 3 trial design is based on positive data reported from the Phase 1/2 trial which was recently reported at the 51st American Society of Hematology meeting. Patients eligible for the Phase 3 trial must have been previously treated with both bortezomib (VELCADE® ) and an immunomodulatory agent (REVLIMID® and/or THALIDOMID® ), and been previously treated with one to four prior lines of therapy. The primary endpoint is progression-free survival and secondary endpoints include overall response rate, overall survival and safety. Patients can be relapsed from and refractory to all non-bortezomib based therapies, however, patients can only be relapsed (progressed > 60 days after discontinuing therapy) from prior bortezomib-based therapies. The study is powered at 90% to demonstrate the required difference in progression-free survival between the two arms. Approximately 265 events (defined as disease progression or death) will trigger the un-blinding of the data.

The Company expects a patient recruitment period of approximately 16-18 months, with study completion within approximately 20-22 months from today.

The trial is being conducted under a Special Protocol Assessment with the FDA.

About Multiple Myeloma

Multiple myeloma, a cancer of the plasma cell, is an incurable but treatable disease. Multiple myeloma is the second most-common hematologic cancer, representing 1% of all cancer diagnoses and 2% of all cancer deaths. According to the American Cancer Society, in 2009 there will be an estimated 20,580 new cases of multiple myeloma and an estimated 10,500 deaths from multiple myeloma in the United States. To date, several FDA approved therapies exist for the treatment of multiple myeloma. Despite this progress, patients continue to relapse, become refractory to prior treatments and eventually die from their disease. Thus, new therapies are needed to treat these patients and extend their survival.
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SOURCE Keryx Biopharmaceuticals, Inc. Copyright©2009 PR Newswire. All rights reserved

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