A Study of Carfilzomib vs Best Supportive Care in Subjects With Relapsed and Refractory Multiple Myeloma

20mg/m² IV on Days 1 and 2 of Cycle 1, escalating to 27 mg/m² IV on Days 8,9,15,and 16 of Cycle 1 and continuing on Days 1,2,8,9,15,and 16 of Cycles 2 through Cycle 9. Cycles 10 and beyond will receive 27 mg/m² IV on Days 1,2,15, and 16 (alternatively, the investigator could choose to continue the dosing frequency on the original dosing days \[Days 1, 2, 8, 9, 15, 16\] for individual subjects).

"Corticosteroid (either prednisolone 30 mg orally (PO) every other day, dexamethasone 6 mg PO every other day, or other equivalent corticosteroid).~Optional cyclophosphamide 50 mg PO once daily may be given at the Investigator's discretion (maximum of 1400 mg per 28-day cycle)."