CD34+ cell dose and CD33- subsets: collection and engraftment kinetics in autologous peripheral blood stem cells transplantation.
OBJECTIVE
We analyzed the factors that affected the number and quality of peripheral blood stem cells (PBSC) collected for transplant in order to establish a minimum threshold for rapid hematopoietic recovery.


METHODS
From January 1995 to November 1996, a consecutive series of 67 patients, with hematologic and solid tumors underwent autologous PBSC transplantation. Collection of PBSC was performed after mobilization with granulocyte-colony stimulating factor (G-CSF) or with chemotherapy (CT) plus G-CSF. We calculated the factors that influenced PBSC collection, the kinetics of granulocyte and platelet recovery and the threshold value of CD34+ cells for a rapid recovery. The data were analyzed by means of multivariate Cox regression model and the receiver operating characteristic (ROC) methodology.


RESULTS
Our results showed that mobilization with chemotherapy plus G-CSF was associated with a higher yield of PBSC in comparison with mobilization with G-CSF alone. Disease status, fewer cycles of conventional prior chemotherapy and absence of prior radiation therapy also influenced the yield of PBSC. The number of CD34+ cells, CD34+CD33- cell subsets, the mobilization schedule, and the conditioning regimen correlated significantly with time to hematopoietic recovery. In the multivariate analysis only the CD34+CD33- cell content and the total number of CD34+ were related with rapid neutrophil and platelet recovery, respectively. Use of G-CSF after transplant significantly shortened the neutrophil recovery time only in patients transplanted with suboptimal dose of PBSC.


CONCLUSIONS
These data suggest the utility of quantitation of CD34+ cells subsets to predict quick engraftment.
Sampol Mayol
A
A
Servicio de Hematología y Hemoterapia, Hospital Son Dureta, Palma de Mallorca, Spain.
Besalduch Vital
J
J
Galmés Llodrá
A
A
Bargay Lleonart
J
J
Matamoros Flori
N
N
Morey Sureda
M
M
Novo García
A
A
Mascaró Riera
M
M
Gonzaléz Bach
E
E
Martínez García
P
P
D000293:Adolescent; D000328:Adult; D015703:Antigens, CD; D018952:Antigens, CD34; D015214:Antigens, Differentiation, Myelomonocytic; D002648:Child; D002675:Child, Preschool; D005260:Female; D006085:Graft Survival; D019650:Hematopoietic Stem Cell Mobilization; D018380:Hematopoietic Stem Cell Transplantation; D006412:Hematopoietic Stem Cells / Q000473:pathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D063268:Sialic Acid Binding Ig-like Lectin 3; D014182:Transplantation, Autologous
D015703:Antigens, CD; D018952:Antigens, CD34; D015214:Antigens, Differentiation, Myelomonocytic; C571163:CD33 protein, human; D063268:Sialic Acid Binding Ig-like Lectin 3