Abstract
An intensified myeloablative conditioning regimen, involving the addition of granulocyte colony-stimulating factor (G-CSF)-combined high-dose cytarabine (12 g/m2) to standard total body irradiation and cyclophosphamide, has been performed for adult patients with myeloid malignancies in single-unit cord blood transplantation (CBT) since 1998 in our institute. We update the results of CBT, as the first allogeneic hematopoietic cell transplantation after this conditioning regimen, in 169 patients with a median long-term follow-up of 10.4 years. The median age was 43 years (range, 16 to 59 years). Ninety-four patients (56%) were in non-remission at the time of CBT, and 124 patients (73%) were acute myeloid leukemia. The median cryopreserved cord blood total nucleated cell dose and CD34+ cell dose was 2.40 × 107/kg and 0.93 × 105/kg, respectively. The cumulative incidence of neutrophil recovery at 42 days was 94.4% (95% confidence interval [CI]: 88.6–97.3%). Among the whole cohort, 105 patients were still alive at the end of the study period. The cumulative incidences of relapse and non-relapse mortality at 10 years were 26.0% (95% CI: 19.5–33.0%) and 16.9% (95% CI: 11.4–23.4%), respectively. There was an overall survival probability of 62.5% (95% CI: 54.3–69.7%) at 10 years. Higher disease risk index alone significantly affected higher overall mortality (hazard ratio 2.21, P = 0.003) in multivariate analysis. These outcomes demonstrate that G-CSF-combined myeloablative conditioning could have favorable long-term remission rates for adult patients with myeloid malignancies undergoing single-unit CBT.
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Acknowledgements
The authors thank all of the physicians and staff at the hospital and the cord blood banks in Japan for their help in this study. We are also grateful to Prof. Shigetaka Asano for his contributions to the field and for his guidance in this study.
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T.K. conceived the project, designed the research, analyzed data, and wrote the paper. All the other authors participated in the treatment of the patients, and acquired the clinical data. All authors approved the final version.
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Konuma, T., Ooi, J., Nagayama, H. et al. Long-term outcomes following the addition of granulocyte colony-stimulating factor-combined high-dose cytarabine to total body irradiation and cyclophosphamide conditioning in single-unit cord blood transplantation for myeloid malignancies. Ann Hematol 101, 177–189 (2022). https://doi.org/10.1007/s00277-021-04676-9
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DOI: https://doi.org/10.1007/s00277-021-04676-9