Analysis of chimerism following allogeneic bone marrow transplantation by fluorescent-in-situ hybridization.
Twelve patients (9 males and 3 females) with chronic myelogenous leukemia, underwent CD8+ T cell depleted allogeneic bone marrow transplantation with a sex-mismatched donor. To assess chimerism we performed fluorescent in-situ hybridization for the X and Y chromosome at different time points after BMT. Patient median age was 33 years (range, 27-48); median time to transplant was 28 months (range, 5-87). All patients received thiotepa 10 mg/kg; cyclophosphamide 120 mg/kg and 12.0 Gy of fractionated total body irradiation. CD8+ cells were depleted from the normal donor marrow with anti-CD8 murine monoclonal antibodies and immunomagnetic beads. Bone marrow aspirates were studied at <60, 60-140, 140-300, and >300 days post BMT. Hybridization was done on mononuclear cells and a median of 518 cells were counted per slide with a fluorescent microscope. The median percentage of donor cells was 99.04%, 98.21%, 98.15%, and 99.52% at <60, 60-140, 140-300, and >300 days after BMT. Mixed chimerism was a rare occurrence after CD8 depleted allogeneic BMT and occured only at low levels. Inhibition of repopulation by host hematopoietic cells may be associated with the graft-versus-leukemia effect against CML.
Rondón
G
G
Department of Hematology, University of Texas, M.D. Anderson Cancer Center, Houston, USA.
Giralt
S
S
Pereira
M
M
Van Besien
K
K
Mehra
R
R
Champlin
R
R
Andreeff
M
M
D000328:Adult; D016026:Bone Marrow Transplantation; D016827:CD8 Antigens / Q000502:physiology; D005260:Female; D006801:Humans; D017404:In Situ Hybridization, Fluorescence; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000235:genetics* / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D018183:Transplantation Chimera; D014184:Transplantation, Homologous; D014960:X Chromosome; D014998:Y Chromosome
D016827:CD8 Antigens