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  • Title: Interleukin-3 followed by GM-CSF for delayed engraftment after autologous bone marrow transplantation.
    Author: Crump M, Couture F, Kovacs M, Saragosa R, McCrae J, Brandwein J, Huebsch L, Beauregard-Zollinger L, Keating A.
    Journal: Exp Hematol; 1993 Mar; 21(3):405-410. PubMed ID: 8440338.
    Abstract:
    Recombinant human interleukin-3 (IL-3) is well-tolerated according to phase I studies, and produces trilineage hematologic responses in patients with normal bone marrow. In addition, promising results have been obtained in a variety of bone marrow failure states. We studied IL-3 in 7 patients with markedly delayed engraftment after autologous bone marrow transplantation (ABMT) for hematologic malignancies (acute myeloid leukemia 4, chronic myeloid leukemia 1, myeloma 1, non-Hodgkin's lymphoma 1). All patients were red blood cell- and platelet transfusion-dependent, had an absolute neutrophil count (ANC) < 0.7 x 10(9)/L and failed to achieve a sustained ANC > 1.0 x 10(9)/L after receiving granulocyte-macrophage colony stimulating factor (GM-CSF) for 28 days. IL-3 was given daily for 21 days at 2 micrograms/kg/d (2 patients) and 5 micrograms/kg/d (5 patients). Toxicity was mild and consisted mostly of low-grade fever and malaise. No changes in platelet, hemoglobin or reticulocyte levels were observed. Four patients had at least a 2-fold increase in ANC at the end of IL-3 treatment. Five patients received GM-CSF 10 micrograms/kg/d subcutaneously for 7 to 10 days immediately after IL-3 and 4 had a further increase in ANC (median 1.7-fold, range 1.6- to 5.8-fold), but no change in platelet transfusion requirements. Hematopoietic colony assays of bone marrow cells obtained before and after treatment showed that granulocyte-macrophage colony-forming cell (CFU-GM) and erythroid blast-forming cell (BFU-E) levels were severely reduced and multilineage progenitors (CFU-GEMM) absent in all patients, and remained low after IL-3 treatment for 21 days. Sequential IL-3 and GM-CSF produced a significant but transient increase in the neutrophil counts of some patients. IL-3 appears to be of limited benefit in patients who are severely aplastic after ABMT and have very low levels of bone marrow progenitors.
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