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A phase I trial of recombinant human interleukin-6 in patients with
myelodysplastic syndromes and thrombocytopenia
MS Gordon, J Nemunaitis, R Hoffman, RL Paquette, C Rosenfeld, S Manfreda, R Isaacs and SD Nimer
Department of Medicine, Indiana University School of Medicine,
Indianapolis, USA.
To evaluate the hematologic effects of recombinant human interleukin-6
(rhIL-6, Escherichia coli, SDZ ILS 969, IL-6), and determine its toxicity
profile, we performed a phase I trial of IL-6 in 22 patients with various
myelodysplastic syndromes (MDS), platelet counts < 100,000/microL, and
< 5% bone marrow (BM) blasts. Patients received one of four doses of
IL-6 (1.0, 2.5, 3.75, and 5.0 micrograms/kg/d) as a subcutaneous injection
on day 1, followed by a 7-day wash-out period, and then 28 days of IL-6
therapy. Dose-limiting toxicities of fatigue, fever, and elevated alkaline
phosphatase were seen at 5.0 micrograms/kg/d; the maximum tolerated dose
was 3.75 micrograms/kg/d. All patients experienced at least grade II fever
and all had an increase in acute phase proteins. Eight patients (36%)
experienced at least a transient improvement in platelet counts; three
fulfilled the criteria for response, whereas five others had clinically
significant increases that failed to meet response criteria. Various
IL-6-related toxicities prevented more than three patients from receiving
maintenance therapy. Two of the three patients who received maintenance
IL-6 therapy had a persistent increase in platelet counts, during 3 and 12
months of IL-6 therapy, respectively. Laboratory studies indicated that
IL-6 increased the frequency of higher ploidy megakaryocytes but did not
significantly increase the number of assayable megakaryocytic progenitor
cells, suggesting that IL-6 acts as a maturational agent rather than a
megakaryocyte colony-stimulating factor. Although IL-6 therapy can promote
thrombopoiesis in some MDS patients, its limited activity and significant
therapy-related toxicity preclude its use as a single agent in this patient
population. Further studies, combining low doses of IL-6 with other
hematopoietic growth factors, are underway.
Volume 85,
Issue 11,
pp. 3066-3076,
06/01/1995
Copyright © 1995 by The American Society of Hematology

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