Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: UNIPROT:Q06643 (non-Hodgkin's lymphoma)
 11,307 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

Bone marrow purging with cyclophosphamide derivatives (Mafosfamide) requires the establishment of a defined experimental procedure for reliable leukemic cell destruction while sparing normal hematopoietic stem cells to ensure engraftment. We previously defined the granulocyte-macrophage colony-forming unit (CFU-GM) LD95 as being the maximum tolerable dose of drug to use. We now report, in 20 patients with acute non-lymphoblastic leukemia (n = 5), acute lymphoblastic leukemia (n = 5), chronic myelogenous leukemia (n = 5), and non-Hodgkin's lymphoma (n = 5), that the nature of the cells treated (i.e., buffy coat cells or mononuclear cells) significantly influences the accuracy of the LD95 determination, whereas other parameters such as hematocrit or nucleated cell concentration do not. We subsequently define the most reliable experimental procedure for in vitro purging with Mafosfamide: incubation of 2 x 10(7) buffy coat cells/ml with a hematocrit of 5%. We show that the wide individual susceptibility to the drug is not related to any incubation procedure. In a series of 163 patients with hematological malignancies, we confirm the large variation of sensitivity to the drug according to patient susceptibility and diagnosis. These data favor the adjustment of the dose of Mafosfamide on an individual basis, prior to bone marrow purging for autologous bone marrow transplantation.
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PMID:Establishment of a reliable experimental procedure for bone marrow purging with mafosfamide (ASTA Z 7557). 265 56

Autologous bone marrow transplantation (ABMT) is used increasingly for the treatment of acute leukemias, lymphomas and solid tumors. Since ABMT is burdened by high risk of relapse, mafosfamide or 4-hydroperoxycyclophosphamide chemical marrow purging is employed. Mafosfamide acts by exerting a potent cytotoxic effect and by promoting apoptosis of leukemic cells. A third proposed mechanism of action involves an effect on immune regeneration in vivo. It was the aim of this study to investigate natural killer (NK) cell regeneration in a group of patients undergoing mafosfamide-purged ABMT. Fifteen patients (8 acute myelogenous leukemia, AML; 4 acute lymphoblastic leukemia, ALL; 3 non-Hodgkin's lymphoma, NHL) were treated with high-dose chemotherapy followed by transplantation with marrow purged with mafosfamide. Prior to ABMT and at different intervals thereafter, NK cell number and function were studied by evaluating the percentage of circulating CD16 positive cells and cytotoxic activity against the leukemic cell line, K562. In comparison to pre-ABMT values, AML patients showed a significant increase in cytotoxic activity, expressed as percentage of chromium release (42.5 +/- 3 vs 32.5 +/- 6, P < or = 0.025 at 4 months) which still persisted at 12 months post-ABMT (54 +/- 6, P < or = 0.05). The behavior of NK functional activity was paralleled by an increase of the percentage of CD16-positive cells (8.4 +/- 2.2 vs 5 +/- 1.3, P < or = 0.05 at 4 months; 12.8 +/- 2.4, P < or = 0.005 at 12 months post-ABMT). Similar significant and long-lasting increments in NK cells were also found in NHL patients.(ABSTRACT TRUNCATED AT 250 WORDS)
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PMID:Natural killer cell regeneration after transplantation with mafosfamide purged autologous bone marrow. 758 Nov 36