Cytoreductive effect of recombinant alpha interferon in patients with myelofibrosis with myeloid metaplasia |
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Authors: | G Barosi L N Liberato A Costa E Ascari |
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Institution: | (1) Dipartimento di Medicina Interna e Terapia Medica, Sezione Clinica Medica 2, IRCCS Policlinico S. Matteo, I-27100 Pavia, Italy |
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Abstract: | Summary In an attempt to reduce myeloproliferation, we administered recombinant -2b interferon (r- INF) to ten patients with myelofibrosis with myeloid metaplasia (MMM) in a hypercellular phase, as part of a phase II trial. Two patients experienced severe side effects and stopped treatment before completion of the first week. In the eight evaluable patients, r- INF was given for 16 weeks at an initial dosage of 3×106 U/day, with monthly increments in the case of response failure, i.e. a decrease in WBC or platelet count of less than 25% of the initial value. Two cases responded at the starting dosage, while the effective dosage was 5×106 U/day in the others. At the end of the 16th week, Hb showed minor changes: from an initial value of 12.08 g/dl, range 8.3–17.3, to 11.6 g/dl, range 7.7–18 (P=0.12); WBC were reduced from 54×109/l, range 6.4–69.4, to 17.5×109/l, range 5–39 (P=0.09, 4/8 responses); platelets decreased from 775×109/l, range 215–1748, to 403×109/l, range 118–730 (P=0.008, 8/8 responses). Minor changes in spleen size were also noted, while no significant changes in bone marrow fibrosis occurred. Influenza-like symptoms and fatigue were common side effects. In conclusion, r- INF has a role as a non-leukemogenic cytoreductive agent in the therapy of MMM, especially for cases with thrombocytosis. |
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Keywords: | Recombinant alpha-interferon Myelofibrosis with myeloid metaplasia Cytoreduction |
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