Abstract
Reduced intensity conditioning (RIC) and nonmyeloablative (NMA) conditioning regimens have expanded use of allogeneic hematopoietic cell transplantation (HCT) in AML to include older and medically less-fit patients, but relative efficacies and toxicities remain poorly defined. Here, we analyzed outcomes from 343 adults transplanted in remission after RIC (n = 137) or NMA (n = 206) conditioning between 2006 and 2021. The characteristics of RIC and NMA HCT patients were similar except that RIC patients were younger and their time between most recent remission achievement and allografting was shorter. There were no significant differences in relapse risk, relapse-free survival (RFS), overall survival (OS), and non-relapse mortality (NRM) between RIC and NMA HCT patients, both overall (relapse: hazard ratio [HR] = 0.80, P = 0.27; RFS: HR = 0.93, P = 0.61; OS: HR = 0.93, P = 0.66; NRM: HR = 1.13, P = 0.59) and when patients were stratified by pre-HCT measurable residual disease (MRD) status. After multivariable adjustment, there was no statistically significant association between conditioning intensity and relapse (HR = 0.69, P = 0.088), RFS (HR = 0.86, P = 0.37), OS (HR = 0.89, P = 0.49), or NRM (HR = 1.37, P = 0.19). In this non-randomized cohort of adults undergoing allografting for AML in first or second remission at our center, we could not detect statistically significant differences in outcomes between those assigned to RIC and those assigned to NMA conditioning.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
Research reported in this publication was supported by grants P01-CA078902, P01-CA018029, and P30-CA015704 from the National Cancer Institute/National Institutes of Health (NCI/NIH), Bethesda, MD, USA. The authors acknowledge the excellent care provided by the physicians advanced practice providers, dietitians, pharmacists, and nurses of the HCT teams, the staff in the Long-Term Follow-up office at the Fred Hutchinson Cancer Center, the Hematopathology Laboratory at the University of Washington, and the patients for participating in our research protocols.
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RBW, BMS, and RS conceptualized and designed this study and participated in data analysis and interpretation and drafting of the manuscript. BMS, MUO, HJD, and RS contributed to the provision of study material, patient recruitment, and acquisition of data. MO conducted all statistical analyses and participated in data interpretation. CO, ERA, GS, and CD contributed to the collection and assembly of data. All authors revised the manuscript critically and gave final approval to submit for publication.
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Walter, R.B., Sandmaier, B.M., Othus, M. et al. Comparison of reduced intensity and nonmyeloablative conditioning for adults with acute myeloid leukemia undergoing allogeneic hematopoietic cell transplantation in first or second remission. Bone Marrow Transplant 58, 377–385 (2023). https://doi.org/10.1038/s41409-022-01909-x
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DOI: https://doi.org/10.1038/s41409-022-01909-x