Before starting treatment in this study, the bone marrow transplant (BMT) doctor will check the subject's general health. Subjects will have the following tests and evaluations to find out if they can participate:--Medical history and physical examination, including height and weight.--Blood tests (approximately 4 - 5 tablespoons) --Urine tests--Chest x-ray--Electrocardiogram (ECG or EKG)--Heart Scan (MUGA)--Pulmonary Function Test (PFT)--Bone marrow biopsies and aspirates. --If Female subjects of child-bearing age will have a serum pregnancy test performed. After eligible patients have been completely staged and exercised consent, they may undergo one cycle of chemotherapy (cyclophosphamide and Mesna) and growth factor (G-CSF) to effect cytoreduction and mobilization of PBSC for collection. All patients will receive high-dose melphalan followed by an autologous stem cell transplant (SCT). Blood tests will be performed frequently to evaluate the subject's response to treatment and possible side effects of treatment. If necessary, platelet and red cell transfusions will be given to maintain adequate levels and antibiotics will be given to treat or prevent infection. Subjects may also require intravenous nutritional support and pain medications during or after transplantation. The study coordinators will collect health information over three years. They will collect information every week for 100 days, then at 6 months, 1 year, 2 years, and 3 years.