The process for auto-SCT comprised the following: (1) up to 3 steady-state leukopheresis procedures to collect and freeze a sufficient quantity of peripheral blood mononuclear cells (PBMCs), with the first leukopheresis performed 3 weeks (± 6 days) after the first immunization; (2) stem cell mobilization with cyclophosphamide, granulocyte-colony stimulating factor (G-CSF) and/or plerixafor; (3) high-dose melphalan (total dose 200 mg/m2) on Days -3 through -1; (4) auto-SCT on Day 0; and (5) re-infusion with thawed PBMCs on Day 3.