Acute megakaryoblastic leukemia with massive myelofibrosis: complete remission and reversal of marrow fibrosis with allogeneic bone marrow transplantation as the only treatment.

We report results of allogeneic bone marrow transplantation in an 8-year-old boy with acute megakaryoblastic leukemia characterized by intense fibrosis together with 20% blast cells in the bone marrow, who was transplanted without preceding chemotherapy for remission induction. Conditioning comprised cytosine arabinoside, cyclophosphamide and total body irradiation. The donor was his HLA-identical sister. The patient is well with minor chronic graft-versus-host disease and normal hematologic values 670 days post-transplant.