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Updated: Dec 26, 2025
Use of Hematopoietic Stem Cell Transplantation to Assess the Origin of Myelodysplastic Syndrome
Published on: October 3, 2018
Myeloablative versus Reduced-Intensity Hematopoietic Cell Transplantation in Myelodysplastic Syndromes: Systematic
Armin Rashidi1, Mohamad A Meybodi1, Wenhao Cao2
1Division of Hematology, Oncology, and Transplantation, Department of Medicine, University of Minnesota, Minneapolis, Minnesota.
Abstract:
In a systematic review and meta-analysis, we compared allogeneic transplant outcomes after myeloablative conditioning (MAC) versus reduced-intensity conditioning (RIC) in patients with myelodysplastic syndromes. Only 2 published randomized clinical trials were found, with a pooled sample size of 183 (RIC, 92; MAC, 91). Both studies suggested an overall survival advantage after RIC, with a pooled hazard ratio (HR) of .67 (95% confidence interval [CI], .41 to 1.09) for RIC versus MAC. Relapse results were also concordant, with a pooled HR of 1.55 (95% CI, .74 to 3.25) for RIC versus MAC. Neither result was statistically significant. Comparisons for other outcomes were unremarkable. In conclusion, the evidence for the optimal conditioning intensity in myelodysplastic syndromes is weak. Post-transplant maintenance strategies and incorporation of genomic information into decision-making may improve post-transplant outcomes.
Insights
For myelodysplastic syndromes, reduced-intensity conditioning (RIC) may offer a survival advantage over myeloablative conditioning (MAC) in allogeneic transplants. However, current evidence is limited, necessitating further research for optimal transplant strategies.
Area of Science:
- Hematology
- Oncology
- Transplant Medicine
Background:
- Myelodysplastic syndromes (MDS) are a group of clonal hematopoietic stem cell disorders.
- Allogeneic stem cell transplantation is a potential curative therapy for MDS.
- Conditioning intensity (myeloablative vs. reduced-intensity) is a critical factor influencing transplant outcomes.
Purpose of the Study:
- To systematically review and compare outcomes of allogeneic transplantation in MDS patients using myeloablative conditioning (MAC) versus reduced-intensity conditioning (RIC).
Main Methods:
- Systematic review and meta-analysis of published randomized clinical trials.
- Pooled analysis of data from 2 trials with a total of 183 patients (92 RIC, 91 MAC).
Main Results:
- Both included studies suggested a trend towards improved overall survival with RIC (pooled hazard ratio [HR] = 0.67; 95% confidence interval [CI], 0.41–1.09).
- Relapse rates were higher with RIC (pooled HR = 1.55; 95% CI, 0.74–3.25), but neither survival nor relapse results reached statistical significance.
- Other evaluated outcomes were unremarkable.
Conclusions:
- The current evidence comparing MAC and RIC for allogeneic transplantation in MDS is limited and statistically inconclusive.
- Further research is needed to determine the optimal conditioning intensity for MDS patients.
- Future improvements may involve post-transplant maintenance and incorporating genomic data into treatment decisions.
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