OUTLINE: Prior to therapy, patients undergo collection of peripheral blood stem cells (PBSC) on another protocol; patients with marrow involvement undergo PBSC harvest only, while all others may also undergo bone marrow harvest. All patients receive cyclophosphamide, etoposide, and carboplatin over 4 consecutive days, followed 3 days later by PBSC or bone marrow and granulocyte colony-stimulating factor. Patients are followed for duration of remission and survival.