Recently, one prospective study showed that a combination conditioning regimen of intravenous busulfan, cyclophosphamide, and etoposide was found to be well tolerated and seemed to be effective in patients with aggressive non-Hodgkin lymphoma. Another prospective study for patients with multiple myeloma showed that intravenous busulfan plus melphalan conditioning regimen made no grade 3-4 non-hematologic complication.