Avaliação de células CD34+ por citometria de fluxo em pacientes em mobilização com G-CSF e a associação com a leucometria

Abstract

Introduction: The use of hematopoietic progenitor cells mobilized in the peripheral blood became the preferred source for autologous transplantation Some factors may affect the mobilization of CD34+ cells in autologous transplantation of hematopoietic progenitor cell (ATHPC). This study aimed to evaluate the influence of these factors and to correlate with the pre-apheresis CD34+ cell count. Method: This is a prospective study evaluating 34 patients submitted to the mobilization of hematopoietic progenitor cells with granulocyte growth factor (G-CSF). Quantification of CD34+ cells in the peripheral blood pre-apheresis and in the final product of the apheresis was performed. The amount of CD34+ cells related to fewer collections was determined to obtain the value needed for the transplantation, in addition to the association with clinical and laboratory data. Results: Out of the 34 patients, 85% had more than 20,000 leukocytes / μl. Of the patients who presented failure during mobilization, all presented < 20,000 leukocytes / μl. There was a statistically significant difference in the association between pre-apheresis CD34+ and the variables age (p = 0.025), leukocyte count (p <0.001) and mononuclear cells (p = 0.001) in peripheral blood. Pre-apheresis CD34+ ≥14 cells/μl was related to better yield of these cells in the final product and with the need for only one collection to obtain the minimum cumulative yield of 2 x 106 CD34+/Kg. Conclusion: This study demonstrates that the age-related CD34+ cell count and patient pre-apheresis leukocyte count was the only factor statistically associated with the number of collections and yield of the final product.