During the Study Period, patients will be randomized to receive 100mg/m2 of either Melphalan HCl for Injection (Propylene Glycol-Free) or Alkeran for Injection on Day -3 and the alternate drug product on Day -2. Blood samples for pharmacokinetic (PK) evaluation will be withdrawn through an indwelling i.v. cannula each day of melphalan dosing (Day -3 and Day -2).