Abstract
Expression of the chemokine receptor CXCR4 by haematopoietic stem cells (HSCs) is believed to influence the process of these cells ‘homing’ back to the bone marrow post-transplantation, in response to the stromal cell-derived factor-1 gradient, followed by engraftment. The primary aim of this retrospective study was to compare reinfused CD34+ cell dose, assessed from the fresh collection, with the post-thaw viable (v) CD34+ and vCD34/CXCR4+ dual positive cell dose as predictors of haematopoietic recovery in multiple myeloma patients undergoing autologous stem cell transplantation. Cryopreserved samples from stem cell collections of 27 myeloma patients were analysed for CD34 and CXCR4 expression and times to haematological engraftment measured. Dosage of transplanted vCD34+ cells was on average 79% of the original calculation from the fresh collection bag (range 29–98%). The median percentage of vCD34+ cells co-expressing CXCR4 was 37% (3.7–97%). Surface expression of CXCR4 by thawed vCD34+ cells was closely correlated to complementary DNA levels. The median dose of CD34/CXCR4+ cells in the autografts was 1.2 × 106/kg (0.2–3.0 × 106/kg) compared with 3.3 × 106/kg for transplanted vCD34+ cells (1.2–5.5 × 106/kg). Both CD34 and vCD34 doses correlated with neutrophil engraftment (p < 0.005) although vCD34/CXCR4+ dose did not. However, patients given a higher dose of CD34/CXCR4+ cells (≥1.75 × 106/kg) showed a faster time to platelet recovery (p < 0.05) than those given a lower dose (≤0.42 × 106/kg). These results warrant further study of CD34/CXCR4 expression by mobilised HSCs and the relationship to platelet recovery post-transplantation on a larger cohort of patients.
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The authors thank Susan Smith for technical assistance with the flow cytometry gating and analysis.
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The authors report no conflicts of interest. The authors alone are responsible for the content and writing of the paper.
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Hicks, C., Isaacs, A., Wong, R. et al. CXCR4 expression on transplanted peripheral blood CD34+ cells: relationship to engraftment after autologous transplantation in a cohort of multiple myeloma patients. Ann Hematol 90, 547–555 (2011). https://doi.org/10.1007/s00277-010-1097-8
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DOI: https://doi.org/10.1007/s00277-010-1097-8