OUTLINE: Patients receive filgrastim (G-CSF) subcutaneously daily beginning on day 1 of the peripheral blood stem cell (PBSC) collection period and continuing until PBSC collection is completed. PBSC are collected beginning on day 5 of the collection period and continuing until the final target cell count is reached or for up to a maximum of 7 collections. If sufficient PBSCs are not harvested within a maximum of 7 collections, the patient is removed from the study. Within 30 days of PBSC collection, patients receive melphalan IV on day -1 of the infusion period and PBSC infusion on day 0. The infusion period continues until day 30. Patients receive G-CSF subcutaneously daily starting on day 1 and continuing until blood counts recover. Patients are followed every 3 months for 2 years, every 3 months for 3 additional years, and yearly thereafter.