Perifosine

NEW YORK, April 28, 2011 /PRNewswire/ -- Keryx Biopharmaceuticals (Nasdaq:KERX - News) today announced the final dataset from the Phase 3 short-term clinical trial of Zerenex™ (ferric citrate) for the treatment of hyperphosphatemia in end-stage renal disease patients on dialysis. The Zerenex data was presented earlier today at the National Kidney Foundation Spring Clinical Meetings being held in Las Vegas, Nevada, in an oral presentation by David S. Goldfarb, M.D., Clinical Chief of Nephrology, NYU Langone Medical Center, Professor of Medicine & Physiology, NYU School of Medicine. On November 30, 2010, the Company issued a press release announcing positive top-line results from this Phase 3 short-term study. Phase 3 short-term study design This Phase 3 study was a multicenter, randomized, open-label trial with a two-week washout period, following which patients were randomized 1:1:1 to receive a fixed dose of Zerenex of either 1 gram, 6 grams or 8 grams per day for a treatment period of 28 days. Zerenex was administered using a 1 gram oral caplet formulation, hence, the fixed-dose arms of 1 gram, 6 grams and 8 grams per day represent 1, 6 and 8 pills per day, respectively. One hundred fifty-one dialysis patients were enrolled into the study. The Intent-to-Treat (ITT) group included 146 patients, representing all patients who took at least one dose of Zerenex and provided a Baseline (at the end of washout) and at least one post-Baseline efficacy assessment. Efficacy assessments were taken weekly starting at Baseline and subsequently at days 7, 14, 21 and 28. EFFICACY DATA ANALYSES The primary endpoint of the study was to determine whether there was a dose response in the change in serum phosphorus from Baseline to Day 28 in the ITT group, using a regression analysis to evaluate this objective. The study met the primary endpoint, with the regression analysis indicating a highly statistically significant dose response (p Additional highlights from Dr. Goldfarb's presentation on Zerenex are as follows: * Statistically significant dose response increase in serum bicarbonate suggests potential to address metabolic acidosis * Statistically significant dose response reduction in calcium x phosphorus product * Modest upward trends in Ferritin and TSAT in 6 grams/day and 8 grams/day dose groups further supports theory that Zerenex could reduce the need for intravenous iron and erythropoiesis-stimulating agent (ESA) use * Zerenex appeared to be safe and well-tolerated in the study * GI adverse events were mostly mild and transient in nature * No SAEs were deemed to be drug-related by the Data Safety Monitoring Committee Dr. Goldfarb concluded that Zerenex has the potential to become a viable alternative to the currently approved phosphate binders used to treat ESRD patients. Ron Bentsur, Chief Executive Officer of Keryx, stated, "We are encouraged by the final efficacy and safety data from the Phase 3 short term study presented earlier today, which confirm the top-line data previously reported." Mr. Bentsur continued, "We thank Dr. Goldfarb for his time and effort in preparing for and delivering this morning's presentation." In accordance with the Company's Special Protocol Assessment (SPA) agreement with the FDA, the Phase 3 clinical program for Zerenex consists of two clinical studies, the completed short-term study, and a long-term safety and efficacy study that is currently ongoing. About Keryx Biopharmaceuticals, Inc. Keryx Biopharmaceuticals is focused on the acquisition, development and commercialization of medically important pharmaceutical products for the treatment of cancer and renal disease. Keryx is developing KRX-0401 (perifosine), a novel, potentially first-in-class, oral anti-cancer agent that inhibits Akt activation in the phosphoinositide 3-kinase (PI3K) pathway, and also affects a number of other key signal transduction pathways, including the JNK pathway, all of which are pathways associated with programmed cell death, cell growth, cell differentiation and cell survival. KRX-0401 has demonstrated both safety and clinical efficacy in several tumor types, both as a single agent and in combination with approved therapies. KRX-0401 is currently in Phase 3 clinical development for both refractory advanced colorectal cancer and multiple myeloma, and in Phase 1 and 2 clinical development for several other tumor types. Each of the KRX-0401 Phase 3 studies is being conducted under a Special Protocol Assessment (SPA) agreement with the FDA. Keryx is also developing Zerenex (ferric citrate), an oral, ferric iron-based compound that has the capacity to bind to phosphate and form non-absorbable complexes. The Phase 3 clinical program of Zerenex for the treatment for hyperphosphatemia (elevated phosphate levels) in patients with end-stage renal disease on dialysis is being conducted pursuant to an SPA agreement with the FDA. Keryx is headquartered in New York City. Cautionary Statement Some of the statements included in this press release, particularly those anticipating future clinical trials and business prospects for Zerenex™ (ferric citrate) may be forward-looking statements that involve a number of risks and uncertainties. For those statements, we claim the protection of the safe harbor for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995. Among the factors that could cause our actual results to differ materially are the following: our ability, and our Japanese partner's ability, to successfully and cost-effectively complete clinical trials for Zerenex (ferric citrate); uncertainties related to the regulatory process; and other risk factors identified from time to time in our reports filed with the Securities and Exchange Commission. Any forward-looking statements set forth in this press release speak only as of the date of this press release. We do not undertake to update any of these forward-looking statements to reflect events or circumstances that occur after the date hereof. This press release and prior releases are available at The information found on our website is not incorporated by reference into this press release and is included for reference purposes only. KERYX CONTACT: Lauren Fischer Director - Investor Relations Keryx Biopharmaceuticals, Inc. Tel: 212.531.5965 E-mail: lfischer@keryx.com

NEW YORK, Sept. 29 /PRNewswire/ --Keryx Biopharmaceuticals, Inc. (Nasdaq: KERX) announced today the initiation of the long-term Phase 3 study of Zerenex (ferric citrate), the Company's iron-based phosphate binder for the treatment of elevated serum phosphorous levels, or hyperphosphatemia, in patients with end-stage renal disease (ESRD) on dialysis. The initiation of this study marks the commencement of the final component of the Company's Phase 3 registration program for Zerenex, which is being conducted in accordance with a Special Protocol Assessment (SPA) agreement with the FDA. Pursuant to the SPA agreement, the Zerenex Phase 3 registration program consists of a short-term efficacy study, which was initiated in May 2010 and is expected to be completed in the fourth quarter of 2010, and the 58-week long-term safety and efficacy study initiated today. The long-term study initiated today is a multicenter, randomized, open-label, safety and efficacy clinical trial with a planned enrollment of approximately 300 ESRD patients on hemodialysis or peritoneal dialysis. The study will consist of a 2-week washout period followed by a 52-week safety assessment in which patients will be randomized 2:1 to receive either Zerenex or an active control. The 52-week safety assessment period will be followed by a 4-week efficacy assessment in which only patients randomized to treatment with Zerenex during the safety assessment period will be randomized in a 1:1 ratio to either continue treatment with Zerenex or switch to placebo for a 4-week efficacy assessment period. Approximately 45 sites in the U.S. and select ex-U.S. sites will participate in the study. Patient enrollment is expected to take approximately 6 to 9 months. Dr. Julia Lewis, Professor of Medicine, Department of Nephrology, Vanderbilt University School of Medicine, and member of the Executive Committee of the Collaborative Study Group, is the Study Chair of the Zerenex Phase 3 registration program. Dr. Samuel S. Blumenthal, Professor of Medicine at Medical College of Wisconsin, is the study's Co-Principal Investigator. Dr. Lewis commented, "We are excited to be leading this long-term safety and efficacy study of Zerenex and are looking forward to the pending completion of the short-term study. While there are treatment options available to patients with hyperphosphatemia, there are safety and compliance concerns associated with the currently marketed therapies. The Phase 3 registration program is designed to confirm prior clinical data which suggests that Zerenex is potentially an attractive, differentiated treatment option for ESRD patients with hyperphosphatemia." Ron Bentsur, Chief Executive Officer of Keryx, commented, "The initiation of the Phase 3 long-term study is an important milestone for the Company and brings us one step closer to potentially providing patients living with hyperphosphatemia with a viable alternative to the marketed phosphate binders. We also look forward to the completion of the Phase 3 short-term efficacy study by year end." Keryx Biopharmaceuticals retains a worldwide exclusive license (except for the Asian Pacific Region) to Zerenex (ferric citrate) from Panion & BF Biotech, Inc. The Company has sublicensed the development of ferric citrate in Japan to Japan Tobacco Inc. and Torii Pharmaceutical Co., Ltd. PHASE 3 PROGRAM DESIGN: In accordance with the Company's SPA agreement with the FDA, the Phase 3 clinical program for Zerenex will consist of two clinical studies, as follows: Short-term efficacy study: A multicenter, randomized, open-label clinical trial with a planned enrollment of approximately 150 ESRD patients on hemodialysis, who will be randomized to fixed doses of Zerenex, ranging from 1 gram per day to 8 grams per day, for a treatment period of 28 days. Patients will undergo a 2-week washout period prior to randomization. The primary endpoint of the study will be to demonstrate a dose response in the change of serum phosphorus from baseline (end of washout period) to end of the treatment period (day 28). Long-term safety and efficacy study: A multicenter, randomized, open-label, safety and efficacy clinical trial with a planned enrollment of approximately 300 ESRD patients on hemodialysis or peritoneal dialysis. The long-term study will consist of a 2-week washout period followed by a 52-week safety assessment period in which patients will be randomized 2:1 to receive either Zerenex or an active control. The 52-week safety assessment period will be followed by a 4-week efficacy assessment in which only patients randomized to treatment with Zerenex during the safety assessment period will be randomized in a 1:1 ratio to either continue treatment with Zerenex or switch to placebo for a 4-week efficacy assessment period. About Special Protocol Assessments The Special Protocol Assessment (SPA) process is a procedure by which the FDA provides official evaluation and written guidance on the design and size of proposed protocols that are intended to form the basis for a new drug application. Final marketing approval depends on the efficacy and safety results, including the adverse event profile, and an evaluation of the benefit/risk of treatment demonstrated in the Phase 3 clinical program. The SPA agreement may only be changed through a written agreement between the sponsor and the FDA, or if the FDA becomes aware of a substantial scientific issue essential to product efficacy or safety. For more information on Special Protocol Assessment, please visit: . About Hyperphosphatemia In the United States, according to data from the U.S. Renal Data System, there are approximately 485,000 patients with end-stage renal disease, or ESRD, and the number of ESRD patients is projected to rise 60% to approximately 785,000 by 2020. The majority of ESRD patients, close to 400,000, require dialysis. Phosphate retention and the resulting hyperphosphatemia in patients with ESRD on dialysis are usually associated with secondary hyperparathyroidism (and its related cardiovascular complications), renal osteodystrophy and soft tissue mineralization. ESRD patients usually require treatment with phosphate-binding agents to lower and maintain serum phosphorus at acceptable levels. The need for alternative phosphate-binding agents has long been recognized, especially given the increasing prevalence of ESRD as well as shortcomings with current therapies. Zerenex has the potential to be an effective and safe treatment in lowering and/or maintaining normal serum phosphorus levels in patients with ESRD and hyperphosphatemia. The market for phosphate binders to treat hyperphosphatemia in ESRD patients in 2009 was approximately $750 million in the U.S. and is approaching $1.5 billion worldwide. About Keryx Biopharmaceuticals, Inc. Keryx Biopharmaceuticals is focused on the acquisition, development and commercialization of medically important pharmaceutical products for the treatment of life-threatening diseases, including cancer and renal disease. Keryx is developing KRX-0401 (perifosine), a novel, potentially first-in-class, oral anti-cancer agent that inhibits Akt activation in the phosphoinositide 3-kinase (PI3K) pathway, and also affects a number of other key signal transduction pathways, including the JNK pathway, all of which are pathways associated with programmed cell death, cell growth, cell differentiation and cell survival. KRX-0401 has demonstrated both safety and clinical efficacy in several tumor types, both as a single agent and in combination with novel therapies. KRX-0401 is currently in Phase 3 clinical development for both refractory advanced colorectal cancer and multiple myeloma, and in Phase 1 and 2 clinical development for several other tumor types. Each of the KRX-0401 Phase 3 studies is being conducted under a Special Protocol Assessment (SPA) agreement with the FDA. Keryx is also developing Zerenex(TM) (ferric citrate), an oral, iron-based compound that has the capacity to bind to phosphate and form non-absorbable complexes. The Phase 3 clinical program of Zerenex in the treatment for hyperphosphatemia (elevated phosphate levels) in patients with end-stage renal disease is being conducted pursuant to an SPA agreement with the FDA. Keryx is headquartered in New York City. Cautionary Statement Some of the statements included in this press release, particularly those anticipating future clinical trials and business prospects for Zerenex may be forward-looking statements that involve a number of risks and uncertainties. For those statements, we claim the protection of the safe harbor for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995. Among the factors that could cause our actual results to differ materially are the following: our ability to successfully and cost-effectively complete clinical trials for Zerenex; the risk that the data (both safety and efficacy) from the Phase 3 trials will not coincide with the data analyses from the Phase 2 clinical trials previously reported by the Company; and other risk factors identified from time to time in our reports filed with the Securities and Exchange Commission. Any forward-looking statements set forth in this press release speak only as of the date of this press release. We do not undertake to update any of these forward-looking statements to reflect events or circumstances that occur after the date hereof. This press release and prior releases are available at . The information found on our website and the FDA website is not incorporated by reference into this press release and is included for reference purposes only. KERYX CONTACT: Lauren Fischer Director - Investor Relations Keryx Biopharmaceuticals, Inc. Tel: 212.531.5965 E-mail: lfischer@keryx.com SOURCE Keryx Biopharmaceuticals, Inc.