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Stem Cell Collection

The inferiority of G-PB to rhG-CSF-mobilized blood and marrow grafts as a stem cell source in patients with high-risk acute leukemia who underwent unmanipulated HLA-mismatched/haploidentical transplantation: a comparative analysis

Abstract

The purpose of this study was to investigate the efficacy and feasibility of unmanipulated haploidentical PBSCT for the treatment of acute leukemia (AL). This study compares the clinical outcomes of high-risk AL patients who received PBSCs harvested from family members sharing at least one common haplotype to outcomes of high-risk AL patients who received a mixture of G-CSF-primed BM (G-BM) and peripheral blood (G-PB) harvests. The results show that PBSCT achieved inferior cumulative myeloid engraftment at 30 days after transplant (89.9±10.1% vs 100%; P=0.04), with lower cumulative incidence of grade II–IV acute GVHD (aGVHD) (37.1±16.5% vs 63.2±6%; P=0.058) compared with G-BM/G-PB transplant. However, both transplant protocols had similar rates of 2-year relapse (29.6±17.1% vs 34.0±5.7%; P=0.954), and PBSCT produced a higher incidence of 2-year non-leukemic mortality (62.5±14.8% vs 35.1±5.1%; P=0.014), as well as lower rates of overall (26.8±12.3% vs 43.2±5.0%; P=0.052) and disease-free survival (26.8±12.3% vs 42.4±5.0%; P=0.071) compared with G-BM/G-PB transplant. These results suggest that haploidentical HSCT is an option for patients with AL who urgently need a graft and do not have matched sibling donors. PBSCT is potentially inferior to G-BM/G-PB transplant, and improvements should be made before PBSCT becomes a routine in unmanipulated mismatched/haploidentical transplant settings.

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Acknowledgements

This work was supported by the National Outstanding Young Scientists' Foundation of China (Grant no. 30725038), the Program for Innovative Research Team in University (IRT0702) and the HI-Tech Research Development Program of China 863 (Grant no. 2006AA02Z4A0). We thank every faculty member who has participated in these studies. We thank Dr Axel R Zander for assisting in editing the paper. We thank Xiangyu Zhao, MD, PhD, for her helpful comments on the statistics. We also thank Liu Yan-Rong and Ya-Zhen Qin, PhD for excellent laboratory support for the MRD test.

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Xu, LP., Liu, KY., Liu, DH. et al. The inferiority of G-PB to rhG-CSF-mobilized blood and marrow grafts as a stem cell source in patients with high-risk acute leukemia who underwent unmanipulated HLA-mismatched/haploidentical transplantation: a comparative analysis. Bone Marrow Transplant 45, 985–992 (2010). https://doi.org/10.1038/bmt.2009.311

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