Anticancer Section / Original Paper
Annibali O. · Tomarchio V. · Gregorj C. · Di Cerbo M. · Armiento D. ·
Antonelli L. · Vincenzi B. ·
Nobile C. ·
Vacca M. · Tirindelli M.C. · Avvisati G.
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Article / Publication Details
Abstract
Introduction: Neoangiogenesis has a crucial role in Multiple Myeloma (MM) and Circulating Endothelial Cells (CECs) contribute to neovascularization by inducing tumor progression and metastasis and by repairing damage to bone marrow vasculature after stem cell transplantation (HSC). We recently proved in a national multicenter study, the possibility to reach a high level standardization in CEC count and analysis based on a polychromatic flow cytometry Lyotube (BD). Our study aimed at assessing the kinetics of CECs in patients with MM undergoing autologous hematopoietic stem cell transplantation (Au-HSCT).
Methods: Blood samples for analysis were collected at different time points before (T0, T1) and after (T2, T3, T4) Au-HSCT. For each sample, 20 × 106 leukocytes were processed as already described (Lanuti 2016 e 2018) through a multistep procedure. CECs were eventually identified as 7-ADDneg/Syto16pos/CD45neg/CD34pos/CD146pos.
Results:Twenty-six MM patients were enrolled in the study. Overall, we observed a constant increase of CECs values from T0 to T3 (day of neutrophil engraftment) followed by decrease at T4 (100 days after transplantation). Using the median value of CECs at T3 we could define a cut-off concentration of 618/mL, with patients with more infective complications having CECs above that value (9/13 vs 2/13; P = .005).
Conclusion: CECs value may be a function of endothelial damage caused by conditioning regimen, as suggested by the increase of their level during the engraftment period. A more severe endothelial damage is reflected by the increase of infective complications in patients with higher CECs value at T3.
S. Karger AG, Basel
Article / Publication Details
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