Melphalan+Bortezomib as a Conditioning Regimen for Autologous and Allogeneic Stem Cell Transplants in Multiple Myeloma

AUTOLOGOUS ARM: Day -3 bortezomib (1.3 mg/m\^2) as an intravenous push over 3 to 5 seconds (follows Melphalan infusion). ALLOGENEIC ARM: Day -3 bortezomib (1.3 mg/m\^2) as an intravenous push over 3 to 5 seconds (follows fludarabine and melphalan infusion).

AUTOLOGOUS ARM: Day -4 and Day -3 Melphalan 100 mg/m\^2/day IV over 30 minutes. ALLOGENEIC ARM: Day -4, Day -3 Melphalan 70 mg/m\^2/day IV over 30 minutes.

Autologous Stem Cell Transplant: Autologous Peripheral Blood Stem Cell Rescue. Stem cell mobilization with granulocyte colony-stimulating factor (GCSF) at a dose of 10 μg/kg/day as per institutional standards. CD34+ peripheral blood stem cells will be collected following the administration of G-CSF as per institutional standards. Day 0 Infusion of autologous stem cells.

Days -6,-5,-4,-3 Fludarabine 30 mg/m\^2/day IV

Allogeneic Stem Cell Transplant: Allogeneic Peripheral Blood Stem Cell Rescue. Day 0 Infusion of allogeneic peripheral blood stem cells. For the allogeneic matched-related donors peripheral blood stem cells will be harvested with GCSF mobilization and infused fresh to the recipients. Allogeneic donor stem cells may also be cryopreserved if they cannot be infused fresh.