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c-Kit (CD117) reactivity in extramedullary myeloid tumor/granulocytic sarcoma.

Abstract：

CONTEXT:c-kit, a proto-oncogene, encodes the transmembrane tyrosine kinase receptor CD117 and is detected by flow cytometry in the majority of cases of acute myeloid leukemia. The prognostic significance of the presence of c-Kit in acute myeloid leukemia is debated. Recently, c-kit inhibitors have been studied as possible therapies against hematopoietic malignancies; therefore, c-Kit detection may have important implications for treatment. OBJECTIVES:In this study, we investigated the expression of c-Kit in granulocytic sarcoma (GS) using paraffin-embedded tissue. DESIGN:Routinely formalin-fixed, paraffin-embedded tissues from 30 cases of GS were studied using immunohistochemistry. c-Kit (C-19) (a polyclonal antibody against carboxy terminal domain of c-Kit p145 or CD117) reactivity was compared with myeloperoxidase and lysozyme. The immunohistochemical panel also included CD34, CD68, CD43, Bcl-2, CD45RB, CD20, CD3, CD10, terminal deoxynucleotidyl transferase (TdT), and CD79a. RESULTS:The morphologic patterns included well-differentiated (5 cases), poorly differentiated (19 cases), and blastic forms (6 cases). Clinical data were obtained from 28 of 30 patients. Granulocytic sarcoma presented in lymph nodes in 10 cases, whereas in 20 cases it presented in extranodal sites. c-Kit reactivity was found in 87% (26/30) of the GS cases. There was no significant difference in c-Kit positivity between the nodal (90%, 9/10) and extranodal (85%, 17/20) neoplasms. c-Kit expression was not associated with the degree of the myeloid maturation. Two of 13 lymphoblastic lymphoma control cases and 1 of 28 of the large B-cell lymphomas were weakly immunoreactive with c-Kit. CONCLUSIONS:c-Kit reactivity can be demonstrated in a high percentage of GS cases; its presence may be useful not only in diagnosis, but also in the treatment of GS with new modalities.

journal_name

Arch Pathol Lab Med

journal_title

Archives of pathology & laboratory medicine

authors

Chen J,Yanuck RR 3rd,Abbondanzo SL,Chu WS,Aguilera NS

doi

10.1043/0003-9985(2001)125<1448:CKCRIE>2.0.CO;2

subject

Has Abstract

pub_date

2001-11-01 00:00:00

pages

1448-52

issue

eissn

0003-9985

issn

1543-2165

journal_volume

125

pub_type

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c-Kit (CD117) reactivity in extramedullary myeloid tumor/granulocytic sarcoma.