Bone Biopsy Study For Dialysis Patients With Secondary Hyperparathyroidism of End Stage Renal Disease

Inclusion Criteria: Subjects will be eligible for the study if they meet all of the following criteria: * One Intact Parathyroid Hormone (iPTH) determination obtained from the central laboratory must be \>/= 300 pg/mL. * One serum calcium determination obtained from the central laboratory must be \>/= 8.4 mg/dL (2.1 mmol/L). * One Bone Alkaline Phosphatase (BALP) determination obtained from the central laboratory must be \>/= 20.9 ng/mL. * Positive histologic confirmation of high bone turnover disease as assessed by the central bone histology center. * Treated with dialysis \>/= 1 month before the date of informed consent. Exclusion Criteria: Subjects will be ineligible for the study if they: * Have an unstable medical condition in the judgment of the investigator. * Are pregnant or nursing women. * Had a parathyroidectomy in the 3 months before the date of informed consent. * For subjects prescribed vitamin D, have received vitamin D therapy for less than 30 days before day 1 or required a change in vitamin D brand or dose level within 30 days before day 1. * Ever received therapy with Sensipar®/Mimpara®