Keryx Biopharmaceuticals, Inc. (Keryx) is focused on the acquisition, development, and commercialization of pharmaceutical products for the treatment of renal disease. The Company is developing KRX-0502, an investigational, ferric citrate, oral compound that binds to phosphate. Under the name Zerenex, KRX-0502 has completed a United States-based Phase III clinical program for the treatment of hyperphosphatemia in patients with chronic kidney disease (CKD) on dialysis.