Affymax Finalizes Treatment Follow-up in Phase 3 Program for Investigational Drug Hematide

Affymax, Inc. has announced completion of treatment and follow-up of patients with anemia due to chronic renal failure enrolled in the four-trial, Phase 3 clinical program for the investigational drug Hematide.

The company said that it expects to report topline results from all four Phase 3 trials in the second quarter of 2010. The Phase 3 clinical program enrolled approximately 2,600 chronic renal failure patients at approximately 400 clinical trial sites.

"Completion of this comprehensive Hematide program marks a major milestone and we anticipate an intensive period of data compilation and analysis," said Arlene Morris, president and chief executive officer of Affymax, Inc. "We look forward to sharing top-line data in the coming months that, if positive, will support our plan to file a NDA for Hematide in chronic renal failure later this year."

In a release, the Company noted:

The Hematide Phase 3 program consisted of four open-label, randomized active-controlled clinical trials in the U.S. and Europe, including two trials in dialysis patients and two others in patients not on dialysis. The Pearl 1 and Pearl 2 trials conducted in non-dialysis patients were designed to evaluate the safety and efficacy of Hematide compared with darbepoetin alfa for treating anemia and maintaining hemoglobin levels over time based on the trial protocol.

In dialysis patients, the Emerald 1 and Emerald 2 trials evaluated the safety and efficacy of Hematide in its ability to maintain hemoglobin levels in the target range when patients were switched from epoetin alfa or epoetin beta to Hematide.

Analysis of efficacy for each of the four studies is based on assessments of non-inferiority to the comparator drugs. The primary efficacy endpoint is the mean change in hemoglobin from baseline. The hemoglobin target range is 11-12 g/dL for non-dialysis patients and 10-12 g/dL for those on dialysis.

In all studies, Hematide was dosed once every four weeks while comparator drugs were dosed more frequently according to their product labels. Treatment in each trial was continued until the last patient had been treated for at least 52 weeks. The primary safety assessment will be determined by the analysis of non-inferiority to comparator drugs using a composite cardiovascular endpoint from a safety database pooled from the four Phase 3 trials. The duration of the Phase 3 program was contingent on collecting a sufficient number of cardiovascular safety events for statistical analysis.

About Hematide

Hematide is a novel synthetic, PEGylated peptidic compound that binds to and activates the erythropoietin receptor and thus acts as an erythropoiesis stimulating agent (ESA).

Affymax and Takeda are collaborating on the development of Hematide and plan to co-commercialize the product once approved in the United States. Phase 3 clinical trials investigated the potential for Hematide to treat anemia associated with chronic renal failure. The product, upon approval, will be commercialized in the European Union by Takeda.

About Anemia in Chronic Renal Failure (CRF)

Anemia in CRF affects many individuals with Chronic Kidney Disease (CKD). According to the National Kidney Foundation, 26 million Americans - 1 in 9 U.S. adults - have CKD. Anemia develops in the early stages of CKD and worsens as patients progress towards total kidney failure and need a dialysis machine to eliminate waste and water from their blood. In severe or prolonged cases of anemia, the lack of oxygen in the blood can cause serious and sometimes fatal damage to the heart and other organs. Benefits of anemia correction in patients with CKD may include decreased morbidity, hospitalization, and mortality.

Affymax, Inc. is a biopharmaceutical company committed to developing novel drugs to improve the treatment of serious and often life-threatening conditions.

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