Efficacy and Safety of Lanthanum in Controlling Serum Phosphate Levels in Subjects With End Stage Renal Disease Who Require Treatment for High Levels of Phosphate in Their Blood

Inclusion Criteria: * Subjects with ESRD who currently require treatment for hyperphosphatemia * Women of childbearing potential must have a negative serum beta HCG pregnancy test and must agree to abstain from sexual activity or to use acceptable contraceptives from the time of informed consent throughout the study Exclusion Criteria: * Treatment with compounds containing calcium, aluminum or magnesium for use as a phosphate binder * Hypocalcaemia * Treatment-naive to any phosphate binder with a serum phosphorus \< 5.5 mg/dL * Any significant gastrointestinal surgery or gastrointestinal disorders