This prospective study evaluated the efficacy and toxicity of intravenous busulfan and melphalan as a conditioning regimen for autologous stem cell transplantation (ASCT) in patients with multiple myeloma (MM). A total of 99 patients with MM, enrolled between January 2013 and March 2016, received intravenous busulfan (9.6 mg/kg) and melphalan (140 mg/m 2 ) before ASCT. The median time to transplant was 6.2 months, and 90 (90.9%) patients underwent ASCT within 12 months of the diagnosis. The overall response rate after ASCT was 94.0%, including 43.5% with a stringent complete response/complete response, 27.3% with very good partial response, and 23.2% with partial response. The most common severe nonhematologic toxicity (grade 3 to 4) was infection (26.3%) and stomatitis (15.2%). Three (3.2%) patients developed veno-occlusive disease. No treatment-related mortality was observed. After a median follow-up of 26.1 months, the median progression-free survival was 27.2 months (range, 13.0 to 41.4 months) and median overall survival was not reached. In conclusion, a conditioning regimen of intravenous busulfan and melphalan was effective and tolerable. ClinicalTrials.gov. number: NCT01923935
Bibliographical noteFunding Information:
This study received financially support from Korea Otsuka: donation of busulfan, and additional research funds for study management.
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