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Ann Diagn Pathol. 2014 Oct;18(5):261-5. doi: 10.1016/j.anndiagpath.2014.01.003. Epub 2014 Jan 13.

Role of p40 and cytokeratin 5/6 in the differential diagnosis of sinonasal undifferentiated carcinoma.

Author information

1
Department of Pathology, All India Institute of Medical Sciences, New Delhi, India. Electronic address: singhlavleen04@yahoo.co.in.
2
Department of Pathology, All India Institute of Medical Sciences, New Delhi, India. Electronic address: rrriiicha@yahoo.co.in.
3
Department of Pathology, All India Institute of Medical Sciences, New Delhi, India.
4
Department of Pathology, All India Institute of Medical Sciences, New Delhi, India. Electronic address: makusi@gmail.com.

Abstract

Sinonasal undifferentiated carcinoma (SNUC) is an epithelial neoplasm of sinonasal region which does not exhibit a squamous or glandular differentiation. The challenge in diagnosis of this entity is the rarity of the disease, the varying morphology of the tumor which leads to gamut of differential diagnosis and the paucity of consistent immunohistochemical markers except pancytokeratin. Forty-one cases of sinonasal epithelial neoplasm consisting of 11 cases of SNUC and 10 cases each of high-grade (grade 3 and 4) esthesioneuroblastoma, undifferentiated nasopharyngeal carcinoma, and poorly differentiated squamous cell carcinoma of the sinonasal region were analyzed for morphology and immunoexpression of CK5/6 and p40. It was found that SNUC did not exhibit immunohistochemical expression of p40 and CK 5/6, suggesting that these could be useful negative immune markers for diagnosis of SNUC.

KEYWORDS:

CK5/6; Epithelial sinonasal malignancies; SNUC; p40

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