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A 45-year-old male was hospitalized on September 2, 1989 with chief complaints of general fatigue and fever. Physical examination revealed hepatomegaly and massive splenomegaly. Laboratory tests on admission showed Hb of 7.5g/dl, PLT 4.8 x 10(4)/microliters and WBC 9,610/microliters with 81% hairy cells. Bone marrow aspirate demonstrated 55.1% hairy cells and moderate myelofibrosis. Cytochemically, hairy cells were positive for tartrate-resistant acid phosphatase (TRAP). Surface markers were SmIg G+ A+ kappa +, CD11b+, CD11c+, CD19+, CD20+, CD21-, CD25+, HC2+, HLA-DR+. From these findings, a diagnosis of hairy cell leukemia (HCL) was made. After administration of deoxycoformycin (DCF) at a dose of 5.0mg/m2 1-2 times monthly, splenomegaly disappeared, as did hairy cells from the peripheral blood. Hematological level returned to within normal range except for the presence of 1.2% hairy cells and mild myelofibrosis in bone marrow aspirates. DCF has so far been effective for this patient. While DCF has been reported to be effective in the treatment of HCL in the West, it has not been determined in Japanese patients with HCL, who have different hematologic features from those of HCL patients in the West.
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