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  • Title: [European-American-type hairy cell leukemia without splenomegaly, treated successfully with deoxycoformycin].
    Author: Muta T, Okamura T, Oshima K, Kikuchi M, Niho Y.
    Journal: Rinsho Ketsueki; 2001 May; 42(5):426-31. PubMed ID: 11452464.
    Abstract:
    A 55-year-old Japanese man was hospitalized on October 5, 1999, because of high fever. Physical examination revealed neither lymphadenopathy nor hepato-splenomegaly. Laboratory data on admission showed a white blood cell count of 1,580/microliter, a hemoglobin level of 9.1 g/dl, and a platelet count of 113 x 10(3)/microliter. A small percentage of abnormal mononuclear cells were present in the peripheral blood. A bone marrow biopsy specimen demonstrated myelofibrosis and diffuse infiltration of abnormal monoculear cells with a mature B cell phenotype. A bone marrow aspirate showed 29% abnormal mononuclear cells, which had an indented or folded nucleus and reticular nuclear chromatin. Moderate to strong tartarate-resistant acid phosphatase activity was detected in these cells. Although the cytoplasmic projections were poorly preserved in specimens stained with May-Giemsa, fresh preparations showed numerous slender cytoplasmic projections by phase-contrast microscopy. The hairy cells had the phenotype CD5-, CD10-, CD11c+, CD19+, CD20+, CD25+, lambda. The patient was diagnosed as having European-American-type hairy cell leukemia (HCL) without splenomegaly, which is quite rare in Japan. The value of phase-contrast microscopy for recognition of the hairy cells was emphasized. The patient was treated successfully with deoxycoformycin (DCF).
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