FNA of epithelioid sarcoma: Curie Institute experience and critical review of the literature.

Abstract:

BACKGROUND:Epithelioid sarcoma (ES) is a rare mesenchymal tumor that is divided into 2 types: classic and proximal. To the authors' knowledge, ES has been poorly studied in cytology, with fewer than 50 cases reported to date. The objective of the current study was to analyze the cytological and immunohistochemical information regarding 5 cases of ES. METHODS:Five cases of ES were analyzed: 4 of proximal type and 1 of classic type. The cases were taken from 4 female patients and 1 male patient. The patients ranged in age from 10 to 75 years. RESULTS:All smears obtained from the proximal type of ES were found to be hypercellular with a necrotic and inflammatory background. Smears from classic-type ES were hypocellular with a hemorrhagic background. Large, dispersed epithelioid cells and loosely cohesive groups of cells were most frequently noted in all cases. All cases of proximal-type ES demonstrated rhabdoid cells and marked nuclear atypia, but in only one case were rhabdoid cells found to be dominant. ES diagnoses were confirmed by immunohistochemistry in histological material. In 4 cases, epithelial marker expression was noted, whereas CD34 was found to be positive in only the classic type of ES. In 2 cases, total loss of SMARCB1/INI1 nuclear expression was observed. In the 2 SMARCB1/INI1-positive cases, loss of SMARCA2/BRM expression was observed in one case and partial loss was observed in the other case. CONCLUSIONS:The proximal type of ES differs from the classic type by the presence of rhabdoid cells and marked nuclear atypia. A specific immunohistochemical profile demonstrating loss of SMARCB1/INI1 or other proteins from the SWI/SNF complex also may be indicative of this diagnosis.

journal_name

Cancer Cytopathol

journal_title

Cancer cytopathology

authors

Gajdzis P,Laé M,Klijanienko J

doi

10.1002/cncy.22052

subject

Has Abstract

pub_date

2018-11-01 00:00:00

pages

934-941

issue

11

eissn

1934-662X

issn

1934-6638

journal_volume

126

pub_type

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