A 22-year-old woman diagnosed as AML (M3) received myeloablative chemotherapy followed by autologous peripheral stem cell transplantation (PBSCT). Rapid hematopoietic reconstitution occurred. By day 10, the neutrophil count was > 0.5 x 10(9)/l and the platelet count > 50 x 10(9)/l. The platelet count was 145 x 10(9)/l on day 20. Purpura developed on the anterior chest and legs on day 50, at which time the platelet count fell to 17 x 10(9)/l. The BM was hypocellular with an increase in megakaryocytes. Platelet-associated IgG (PAIgG) was 88.1 ng/10(7) platelets (normal range 9-25 ng/10(7)); a diagnosis of idiopathic thrombocytopenic purpura (ITP) was made. Prednisolone administration led to an increase in the platelet count and a decrease in PAIgG. Analysis of lymphocyte subsets revealed an increased number of CD3+ gamma/delta T cells. It is postulated that the thrombocytopenia in this case was due to an autoimmune mechanism such as ITP.
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