RATIONALE: Giving high-dose chemotherapy before a peripheral blood stem cell transplant stops the growth of cancer cells by stopping them from dividing or by killing them. Giving colony-stimulating factors, such as G-CSF, helps stem cells move from the bone marrow to the blood so they can be collected and stored. The stem cells are then returned to the patient to replace the blood-forming cells that were destroyed by high-dose chemotherapy and radiation therapy.