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- W2416257919 abstract "Antigen CD34+ cells represent 1-4% of adult bone marrow cells comprising virtually all hematopoietic colony-forming progenitors in-vitro and probably also stem cells capable of restoring hematopoiesis of lethally irradiated hosts. We report that sizable numbers of CD34+ cells transiently circulate in the peripheral blood (PB) of patients treated with high-dose (7 g/sqm) cyclophosphamide (HD-CTX) with or without recombinant human glycosylated granulocyte macrophage colony stimulating factor (rhGM-CSF). Evidence is presented demonstrating that CD34+ cells from PB possess qualitatively normal hematopoietic colony growth and high cloning efficiency similarly to marrow CD34+ cells. In addition, CD34+ cells from PB are shown to display heterogeneous flow cytometry characteristics and differentiation antigens analogous to those from bone marrow, i.e., CD34+/CD33-, CD34+/CD13-, CD34+/CD38-, CD34+/CD11b, CD34+/DRlow+ cells have light scatter properties of small lymphocytes while CD34+/CD33+, CD34+/CD13+, CD34+/CD38+, CD34+/CD11b+, CD34+/DRhigh+ cells have light scatter properties of blast-like cells. In HD-CTX treated patients, CD34+ cell circulation is 5-fold enhanced by rhGM-CSF 5.5 micrograms/kg/day by continuous iv infusion for 14 days. During the second-third week after HD-CTX, large-scale collection of PB leukocytes by 3-4 continuous-flow leukaphereses allows the yield of 2.19-2.73 x 10(9) or 0.45-0.56 x 10(9) CD34+ cells, depending on whether or not patients receive rhGM-CSF. The number of CD34+ cells retrieved from PB by leukaphereses exceeds the number that can be harvested by multiple bone marrow aspirations under general anesthesia.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W2416257919 date "1990-01-01" @default.
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- W2416257919 title "Heterogeneity of circulating hematopoietic progenitors in cancer patients treated with high-dose cyclophosphamide and recombinant human granulocyte macrophage colony stimulating factor (rhGM-CSF)." @default.
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