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Fourty-four patients with acute myeloblastic leukaemia were treated with RP 22050, a new, semisynthetic derivative of daunorubicin. Complete remissions were achieved in 20 patients (45%). The median dose given was 23 mg/kg. The toxicity of RP 22050 is mainly haematological. Resistance rather than death in aplasia seemed to be the cause of failure of therapy.
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