Thyroid transcription factor 1 and cytokeratins 1, 5, 10, 14 (34betaE12) expression in basaloid and large-cell neuroendocrine carcinomas of the lung.

Abstract:

:Basaloid carcinoma (BC) and large-cell neuroendocrine carcinoma (LCNEC) are 2 recently recognized variants of large-cell lung carcinomas that may overlap in their morphology, and are discriminated by expression of neuroendocrine markers in LCNEC. Because thyroid transcription factor 1 (TTF-1) is expressed in lung adenocarcinomas but not in squamous cell carcinomas (SCC), and 34betaE12 recognizes a set of high-molecular-weight cytokeratins characteristic of basal stem cells, we hypothesized that these 2 markers could help in distinguishing BC from LCNEC. Immunostaining for TTF-1 was detected in 40.9% of pure LCNEC but in no BC or basaloid variant of SCC. In contrast, immunoreactivity for 34betaE12 was shown in all BC and basaloid variant of SCC but in only 1 LCNEC. Bouin fixation was less efficient than formalin in the immunodetection of both markers for its well-known deleterious effect on antigen preservation. Specificity of TTF-1 for LCNEC (100%) and that of 34betaE12 for BC (98.3%) exceeded that of NE markers for distinction of these 2 entities. These data show that TTF-1 and 34betaE12, in association with specific neuroendocrine markers, represent a useful panel of antibodies in differentiating carcinomas presenting with a solid pattern, palisading, or pseudorosettes, the expression of TTF-1 excluding the diagnosis of BC, and staining with 34betaE12 excluding pure LCNEC.

journal_name

Hum Pathol

journal_title

Human pathology

authors

Sturm N,Lantuéjoul S,Laverrière MH,Papotti M,Brichon PY,Brambilla C,Brambilla E

doi

10.1053/hupa.2001.27110

subject

Has Abstract

pub_date

2001-09-01 00:00:00

pages

918-25

issue

9

eissn

0046-8177

issn

1532-8392

pii

S0046-8177(01)14496-5

journal_volume

32

pub_type

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