Safety, Efficacy, and Pharmacodynamics of a 60-Minute Infusion of Carfilzomib for Progressive Multiple Myeloma

"Phase 1: Carfilzomib will be administered at an escalating dose by cohort as 60-minute IV infusion on Days 1, 2, 8, 9, 15, and 16 of a 28-day cycle. On Cycle 1 Days 1 and 2, carfilzomib will be given at 20 mg/m\^2. For all subsequent doses, carfilzomib will be administered at the dose assigned to the cohort (56, 70, or 88 mg/m\^2). Dexamethasone (8 mg IV or PO) will be administered prior to carfilzomib on Days 1, 2, 8, 9, 15, and 16.~Phase 2: Carfilzomib will be administered at the MTD determined in phase 1. Maintenance: From Cycle 9 onward, carfilzomib and dexamethasone will be administered in the same fashion as during the previous treatment cycle, but only on days 1, 2, 15, and 16."