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From 1981 to 1995, we diagnosed, followed and treated at our institution fifty-eight cases of essential thrombocythemia (ET), using hydroxyurea (HU) as first-line therapy in these patients. Three patients who were continuously receiving HU had a leukemic transformation after a chronic phase of respectively 47, 81 and 90 months. One patient developed an acute leukemia with minimal myeloid differentiation...
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