title: Early peripheral blood and T-cell chimerism dynamics after umbilical cord blood transplantation supported with haploidentical cells.
abstract: Single-unit umbilical cord blood (CB) SCT is limited by low total nucleated cell (TNC) dose. Co-infusion of CD34+ cells from a third party HLA-mismatched donor, known as dual or haplo-cord transplant, reduces the period of post-transplant neutropenia and related complications. The aim of this study was to analyze the value of early post-transplant peripheral blood (PB) and T cell chimerism after 28 dual transplants regarding CB engraftment. Cumulative incidence of myeloid engraftment at 30 days was 93% with a median time to engraftment of 14 days (10-29). Patients who developed CB graft failure (n=5) showed very low percentages of CB cells on days +14, +21 and +28 with decreasing dynamics. On the other hand, percentages of CB cells in patients who achieved CB engraftment increased over time. Interestingly, such patients showed two distinct chimerism dynamics in PB, but all of them showed a predominance of CB T cells early after SCT with increasing dynamics over time. Early post-transplant chimerism dynamics in PB and T cells predicts CB graft failure enabling rapid therapeutic measures to be applied. On the other hand, early increasing percentages of CB T cells correlates with ultimate CB engraftment.
authors.affiliation: Gregorio Marañón Institute for Health Research, Department of Hematology, Hospital General Universitario Gregorio Marañón, Madrid, Spain.
authors.forename: M
authors.initials: M
authors.lastname: Kwon
authors.affiliation: Gregorio Marañón Institute for Health Research, Department of Hematology, Hospital General Universitario Gregorio Marañón, Madrid, Spain.
authors.forename: C
authors.initials: C
authors.lastname: Martínez-Laperche
authors.affiliation: Gregorio Marañón Institute for Health Research, Department of Hematology, Hospital General Universitario Gregorio Marañón, Madrid, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Balsalobre
authors.affiliation: Gregorio Marañón Institute for Health Research, Department of Hematology, Hospital General Universitario Gregorio Marañón, Madrid, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Serrano
authors.affiliation: Gregorio Marañón Institute for Health Research, Department of Hematology, Hospital General Universitario Gregorio Marañón, Madrid, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Anguita
authors.affiliation: Gregorio Marañón Institute for Health Research, Department of Hematology, Hospital General Universitario Gregorio Marañón, Madrid, Spain.
authors.forename: J
authors.initials: J
authors.lastname: Gayoso
authors.affiliation: Gregorio Marañón Institute for Health Research, Department of Hematology, Hospital General Universitario Gregorio Marañón, Madrid, Spain.
authors.forename: J L
authors.initials: JL
authors.lastname: Díez-Martín
authors.affiliation: Gregorio Marañón Institute for Health Research, Department of Hematology, Hospital General Universitario Gregorio Marañón, Madrid, Spain.
authors.forename: I
authors.initials: I
authors.lastname: Buño
mesh_terms: D000328:Adult; D046528:Chimerism; D015331:Cohort Studies; D036101:Cord Blood Stem Cell Transplantation / Q000379:methods*; D018572:Disease-Free Survival; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D019172:Transplantation Conditioning / Q000379:methods*; D014184:Transplantation, Homologous / Q000379:methods*; D055815:Young Adult