title: Features of the engraftment of allogeneic hematopoietic stem cells using reduced-intensity conditioning regimens.
abstract: The features of the engraftment in 26 patients allografted using reduced-intensity conditioning regimen (8 with chronic myelogenous leukemia, 6 with acute myelogenous leukemia, 9 with acute lymphoblastic leukemia, 1 with hybrid acute leukemia, 1 with myelodysplasia and 1 with thalassemia major) were analyzed. Patients received a median of 10 x 10(8)/Kg mononuclear cells (range 1.6 to 22.9), and a median of 4.2 x 10(6)/Kg CD34 cells (range 0.3 to 14). There was a linear correlation between the number of infused mononuclear cells (MNC) and that of CD34 cells (r = 0.78, p = 0.002). Three patients (11%) failed to engraft; in those who engrafted, the median time to achieve > 500 granulocytes was 11 days (range 10 to 22), and the median time to achieve > 10,000 platelets was 12 days (range 10 to 41). The three patients who failed to engraft received less than 5 x 10(8)/Kg MNC (1.6, 4.6 and 4.9) and less than 0.5 x 10(6)/Kg CD34; however, five of eight patients who received less than 5 x 10(8)/Kg MNC still engrafted successfully. On the other hand, all the patients who received less than 0.5 x 10(6)/Kg CD34 cells failed to engraft. Within the group of patients who engrafted, it was found that those who received more than 7 x 10(6)/Kg CD34+ cells tended to earlier recover > 20 x 10(9)/L platelets (p = 0.02), and > 0.5 x 10(9)/L neutrophils (p = 0.06) before day 15, than those who received less than 7 x 10(6)/Kg CD34+ cells. No such association could be established between the number of MNC and the time for recovery. In these patients allografted using reduced-intensity conditioning regimens, the target doses of hematopoietic cell used were similar to those described for conventional allografts: The number of CD34 infused cells was significantly related to the possibility of failure to engraft and to the recovery rate of the hemopoiesis.
authors.affiliation: Centro de Hematología y Medicina Interna de Puebla, Laboratorios Clínicos de Puebla, 8B Sur 3710, 72530 Puebla, PUE, Mexico. gruiz1@prodigy.net.mx
authors.forename: G J
authors.initials: GJ
authors.lastname: Ruiz-Argüelles
authors.forename: A
authors.initials: A
authors.lastname: Ruiz-Argüelles
authors.forename: D
authors.initials: D
authors.lastname: Gómez-Almaguer
authors.forename: B
authors.initials: B
authors.lastname: López-Martínez
authors.forename: G
authors.initials: G
authors.lastname: Abreu-Díaz
authors.forename: G
authors.initials: G
authors.lastname: Bravo
authors.forename: J C
authors.initials: JC
authors.lastname: Jaime-Pérez
mesh_terms: D000293:Adolescent; D000328:Adult; D018952:Antigens, CD34; D001772:Blood Cell Count; D002648:Child; D002675:Child, Preschool; D005260:Female; D006085:Graft Survival; D019337:Hematologic Neoplasms / Q000628:therapy; D006410:Hematopoiesis; D018380:Hematopoietic Stem Cell Transplantation / Q000379:methods*; D006801:Humans; D007166:Immunosuppressive Agents / Q000008:administration & dosage; D007937:Leukapheresis / Q000592:standards; D007958:Leukocyte Count; D007963:Leukocytes, Mononuclear; D008297:Male; D008875:Middle Aged; D013997:Time Factors; D019172:Transplantation Conditioning / Q000379:methods*; D014184:Transplantation, Homologous / Q000379:methods; D014740:Vidarabine / Q000008:administration & dosage / Q000031:analogs & derivatives
chemical_list: D018952:Antigens, CD34; D007166:Immunosuppressive Agents; D014740:Vidarabine; C024352:fludarabine