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In vitro restoration of polyclonal hematopoiesis in a chronic myelogenous leukemia after in vitro treatment with 4- hydroperoxycyclophosphamide

G Degliantoni, L Mangoni and V Rizzoli

Bone marrow cells of a 45-year-old female with Philadelphia chromosome (Ph1)-positive, early-phase chronic myelogenous leukemia (CML), who was heterozygous for the glucose-6-phosphate dehydrogenase (G6PD) locus, were pretreated in vitro with 4-hydroperoxycyclophosphamide (4-HC) and tested for G6PD activity in several colony formation assays and for karyotypic abnormalities. All cells within the mixed (CFU-GEMM), the erythroid burst (BFU-E), and the granulocyte-macrophage (CFU-GM) colonies expressed type A and type B G6PD activity and a normal karyotype, whereas untreated cells expressed type A G6PD and the Ph1 chromosome. This reversal of G6PD activity type and the disappearance of the Ph1 chromosome in colonies grown from 4-HC-treated cells indicate that this cytotoxic agent spares a residual normal stem cell population in bone marrow cells of early-phase CML patients. This finding, in turn, suggests a therapeutic approach in CML based on in vitro chemotherapy of autologous bone marrow grafts.

Volume 65, Issue 3, pp. 753-757, 03/01/1985
Copyright © 1985 by The American Society of Hematology


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