Signet-ring cell change in adenoid cystic carcinoma: a clinicopathological and immunohistochemical study of four cases.
Histopathology
; 62(4): 531-42, 2013 Mar.
Article
em En
| MEDLINE
| ID: mdl-23379326
AIMS: Signet-ring cell (SRC) change has not been reported in adenoid cystic carcinoma (ACC). The aim of this study was to describe the clinicopathological and immunohistochemical findings in four cases of ACC with SRCs (ACC-SRC), in which the relative proportion of the SRC component ranged from 25% to 50%. METHODS AND RESULTS: The median age was 58 years (range: 48-81 years), and all patients were women. The involved sites were sinonasal, lip, and submandibular. Two patients developed lung metastasis, and one died of disease 63 months after tumour resection. Neither mucinous nor lipid substances were detected in the SRCs. These showed positive staining for AE1/AE3, cytokeratin 14, and epithelial membrane antigen, which highlighted the intracytoplasmic vacuole borders. The SRC nests were surrounded by myoepithelial cells positive for α-smooth muscle actin and p63. The SRCs showed similar p53 positivity but lower Ki67 and mitotic indices than the conventional component. SRCs were c-Myb-negative. Ultrastructural examination revealed that the intracytoplasmic vacuoles were lumina lined by microvilli. CONCLUSIONS: ACC-SRC is a non-mucin-producing and non-lipid-producing phenomenon, possibly related to disturbed differentiation of ductal/luminal cells. This cellular modification in ACC apparently does not change the biological behaviour of the tumour, but it may cause significant diagnostic problems, particularly in incisional biopsies.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Neoplasias Labiais
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Neoplasias da Glândula Submandibular
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Neoplasias Nasais
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Carcinoma de Células em Anel de Sinete
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Carcinoma Adenoide Cístico
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Neoplasias Primárias Múltiplas
Limite:
Aged80
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Female
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Humans
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Middle aged
Idioma:
En
Revista:
Histopathology
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Brasil
País de publicação:
Reino Unido