Volume 49, Issue 8 pp. 752-758

Diffuse large B cell lymphoma expressing the natural killer cell marker CD56

Toru Sekita

Toru Sekita

First Department of Pathology, School of Medicine, Chiba University, Chiba,

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Jun-ichi Tamaru

Jun-ichi Tamaru

First Department of Pathology, School of Medicine, Chiba University, Chiba,

Department of Pathology, Saitama Medical Center, Saitama Medical School, Kawagoe, Japan

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Kouichi Isobe

Kouichi Isobe

First Department of Pathology, School of Medicine, Chiba University, Chiba,

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Kenichi Harigaya

Kenichi Harigaya

First Department of Pathology, School of Medicine, Chiba University, Chiba,

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Syu-ichi Masuoka

Syu-ichi Masuoka

Department of General Internal Medicine, Kashiwa Hospital, Jikei University, School of Medicine, Kashiwa and

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Toshio Katayama

Toshio Katayama

Department of General Internal Medicine, Kashiwa Hospital, Jikei University, School of Medicine, Kashiwa and

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Masayuki Kobayashi

Masayuki Kobayashi

Department of General Internal Medicine, Kashiwa Hospital, Jikei University, School of Medicine, Kashiwa and

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Atsuo Mikata

Atsuo Mikata

First Department of Pathology, School of Medicine, Chiba University, Chiba,

Department of Pathology, Saitama Medical Center, Saitama Medical School, Kawagoe, Japan

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First published: 04 January 2002
Citations: 19
Correspondence: DrToruSekita First Department of Pathology, School of Medicine, Chiba University, Internal Medicine, Kanagawa Rehabilitation Center, 516 Nanasawa, Atugi City, Kanagawa 243-0121, Japan

Abstract

The expression of the natural killer (NK) cell antigen, CD56, in hematological malignancies is rare. However, there are several reports that some hematological malignancies, such as T/NK cell lymphoma, multiple myeloma (MM) and acute myeloid leukemia (AML), express this molecule. In B cell non-Hodgkin’s lymphomas (NHL), however, very limited number of cases have been reported to express CD56 molecule. Although one study has recently described that half of microvillous B cell lymphoma (MVL), an uncommon subset of large cell lymphoma, expressed CD56, there have been no reports about most common type of B-NHL, diffuse large B cell lymphoma (DLBL) other than a mention of weak CD56 expression in one of 83 DLBL. We herein presented the first case of diffuse large B cell lymphoma expressing CD56 clearly. The immunophenotype determined by immunostaining and flow cytometric analysis was CD10+, CD19+, CD20+, CD45RO, CD3 and CD56+. On immunohistochemical study, neither bcl-2 nor TIA-1 was positive for tumor cell. Monoclonal immunoglobulin heavy chain (IgH) gene rearrangement was detected, and the sequence analysis of the variable region of IgH (VH) suggested that this tumor was derived from antigen selected post germinal center B cell. Conventional combination chemotherapy (CHOP) was administered, and the patient has still been in complete remission for 10 months.

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