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A case of hemophagocytic syndrome that developed in a patient with T-cell acute lymphoblastic leukemia (ALL) with a novel chromosome translocation involving 14q11 is reported. A 15-year-old boy with T-cell ALL in relapse showed leukemic cells with an abnormal karyotype of 46,XY,-15,t(11;14)(p15;q11), +der(15)t(15;?)(p11;?). Pancytopenia and extensive hemophagocytosis by macrophages in the bone marrow were observed after reinduction chemotherapy and again at the terminal stage. At autopsy, infiltration of such cells was also found in other organs. The findings suggested occurrence of hemophagocytic syndrome probably associated with cytomegalovirus (CMV) infection. The t(11;14)(p15;q11) may be a novel translocation specific for T-cell ALL, and conceivably, the association of T-cell ALL with the histiocytosis in this patient may not have been coincidental.
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