We describe a patient with chronic granulocytic leukaemia (CGL) who relapsed after allogeneic bone marrow transplantation (BMT). Interferon alpha 2b (IFN alpha 2b) induced and maintained a complete remission. IFN alpha 2b led to full restoration of donor bone marrow. This case provides evidence to support a trial of IFN alpha in patients with relapsing CGL after BMT.
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