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Histopathology. 2012 Sep;61(3):454-64. doi: 10.1111/j.1365-2559.2012.04247.x. Epub 2012 Jun 11.

Extrapulmonary small cell carcinoma: a clinicopathological study with identification of potential diagnostic mimics.

Author information

1
Department of Pathology, Manchester Royal Infirmary, Manchester, UK. amquinn2003@yahoo.co.uk

Abstract

AIMS:

To evaluate the clinicopathological features of small cell carcinoma arising outside the lung.

METHODS AND RESULTS:

Thirty-seven cases with a pathology diagnosis of extrapulmonary small cell carcinoma (EPSCC) were selected. The clinical notes were reviewed and tumour blocks were selected for a fresh haematoxylin and eosin (H&E) section and immunohistochemical stains. The most common tumour locations were cervix and bladder. Twenty-five cases (68%) were finally diagnosed as EPSCC, nine of which were found with coexisting non small cell carcinoma. Two cases (5%) were diagnosed as large cell neuroendocrine carcinoma (LCNEC) of the cervix. The remainder was classified as 10 poorly differentiated carcinomas (PDCs) (27%). Positive staining for thyroid transcription factor 1 (TTF-1) was noted in nine cases of EPSCC and in none of the cases of PDC (P = 0.034). Synaptophysin immunoreactivity was found in 20 cases of EPSCC and two cases of PDC with neuroendocrine differentiation (P = 0.002), as well as two cases of LCNEC. 34βE12 was positive in eight cases of SCC and two cases of PDC.

CONCLUSIONS:

Based on this series, EPSCC may be overdiagnosed. Immunohistochemistry for TTF-1, used in combination with synaptophysin, may help to discriminate EPSCC from PDC.

[Indexed for MEDLINE]

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