Phase III Double-blind Comparative Study of BAY77-1931 (Lanthanum Carbonate) With Calcium Carbonate

Inclusion Criteria: * Pre-dialysis serum phosphate levels: ≧5.6 mg/dL and \<11.0 mg/dL at 1 week after the initiation of the washout period. * Out-patient * Undergoing hemodialysis three times per week for at least previous 3 consecutive months Exclusion Criteria: * Pre-dialysis serum phosphate levels of ≧10.0 mg/dL at the start of the washout period or ≧11.0 mg/dL at 1 week after * Corrected serum calcium level of \<7.0 mg/dL or ≧11.0 mg/dL at the start of the washout period and/or 1 week after * Serum intact PTH (Parathyroid) of ≧1000 pg/mL at the start of the washout period * Pregnant woman, or lactating mother * Significant gastrointestinal disorders including known acute peptic ulcer * Liver dysfunction * History of cardiovascular or cerebrovascular diseases * Requiring treatment for hypothyroidism