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There is endothelial activation and damage in hematopoietic stem cell transplantation (HSCT). The impact of the conditioning and type of HSCT on endothelial dysfunction in the early phases of HSCT has been evaluated. Plasma samples were obtained before and at different times after autologous and allogeneic HSCT with and without early complications. Changes in soluble markers of endothelial damage (VWF, ADAMTS-13, sVCAM-1, sICAM-1, and sTNFRI) were measured. There were changes in all markers evaluated that followed different patterns in auto and allo settings. For VWF and sTNRI, progressive increases from day Pre to day 14 and to day 21 were observed in the auto and the allo group, respectively. ADAMTS-13 activity correlated inversely with VWF levels. Levels of sVCAM-1 decreased until day 7, and raised significantly to day 14 and to day 21 in the auto and the allo HSCT, respectively. No …