This study was stopped by the sponsor based on a non-safety related corporate decision

The main aim of this research study is to see if giving Fosrenol®, a chewable tablet, to patients on haemodialysis works as well as other treatments currently used to lower blood phosphorus levels.

Inclusion Criteria:

• Male or female subjects greater than or equal to 18 years of age receiving a stable regimen of haemodialysis for chronic kidney disease (CKD) Stage 5 (defined as haemodialysis two or three times per week for at least two months prior to screening).
• Females of child bearing potential (FOCP) must be non-pregnant, non-lactating, have a negative serum beta human chorionic gonadotropin (HCG) test, and agree to comply with any applicable contraceptive requirements of the protocol.
• Subjects on a stable phosphate binder dose (defined as no change in medication or dosage for at least the one month prior to screening) with a serum phosphorus level between greater than 1.78 and less than or equal to 2.43 mmol/L (5.5 and 7.5 mg/dL).

Exclusion Criteria:

• Subjects with a corrected serum calcium level less than 2.1 mmol/L (8.5 mg/dL).
• Subjects with an intact parathyroid hormone (iPTH) level greater than 500 pg/mL, or a history of previous parathyroidectomy within 12 months of screening.
• Subjects with any significant bowel obstruction, active inflammatory bowel disease, gastrointestinal (GI) motility disorders, abnormal or irregular bowel motion, or a history of major GI surgery within the last 6 months will be excluded.
• Subjects receiving aluminium, magnesium, or combination therapy other than sevelamer hydrogen chloride (HCl) and calcium as a phosphate binder at the time of screening will be excluded.