Comparison of I.V. CTAP201 and Doxercalciferol (Hectorol) in Subjects With Chronic Kidney Disease (CKD) and Secondary Hyperparathyroidism (SHPT)

Inclusion Criteria: * Body mass index between 18 and 40 * On maintenance hemodialysis three times per week * Visit 1: Serum iPTH value greater than or equal to 200 pg/mL and lower than or equal to 1000 pg/mL * Visit 1: Serum total calcium value greater than 8.4 mg/dL and lower than 10.0 mg/dL * Visit 1: Serum phosphorus value greater than or equal to 2.5 mg/dL and lower than or equal to 5.5 mg/dL * Serum 25-hydroxyvitamin D level greater than or equal to 15 ng/mL * Visit 2: Serum iPTH value greater than 300 pg/mL * Visit 2: Serum Ca x P product less than 56 \[mg/dl\]2 * Willing and able to discontinue vitamin D and/or bone metabolism therapy for at least 2 weeks prior to administration of Study Drug, and length of study Exclusion Criteria: * Taking cytochrome P450 3A inhibitors and/or inducers * Abnormal liver functions