Incidence and significance of cytoplasmic thyroid transcription factor-1 immunoreactivity

Pablo A. Bejarano, Fathema Mousavi

Research output: Contribution to journalArticle

28 Citations (Scopus)

Abstract

Context. - The immunohistochemical identification of thyroid transcription factor-1 (TTF-1) is regarded as the presence of a nuclear pattern of staining and is used to identify tumors of thyroid or pulmonary origin. Although there have been reports of cytoplasmic expression of TTF-1, the significance of this pattern has not been studied in detail. Objectives. - To determine the incidence at which cytoplasmic immunostaining for TTF-1 occurs and to analyze the diagnostic value of this pattern of immunoreactivity. Design. - Histologic sections of 361 consecutive cases of neoplasms stained for TTF-1 were reviewed, and those showing cytoplasmic staining in the tumor cells or in non-neoplastic cells were selected. Clinical correlation was obtained on the latter cases regarding the origin of the tumor. Setting. - An immunohistochemistry laboratory in a tertiary-care institution. Results. - The 361 tumors were obtained from 29 organ sites and corresponded to primary and metastatic neoplasms. Twenty-three (6.3%) tumors showed cytoplasmic staining for TTF-1. In 13 of these, the primary site of origin was established with certainty: 7 were lung carcinomas (3 primary lung adenocarcinomas, 1 primary large cell carcinoma, 1 metastatic small cell carcinoma to the liver, 1 metastatic adenocarcinoma to a neck lymph node, and 1 metastatic adenocarcinoma to thigh soft tissue), 3 colonic adenocarcinomas (2 metastases to vertebrae and 1 to lung), 1 metastatic breast ductal adenocarcinoma to femur, 1 metastatic laryngeal squamous cell carcinoma to liver, and 1 meningioma involving the orbit bone. There were 3 lung carcinomas with concomitant nuclear immunostaining. Nonneoplastic liver tissue was the most frequent non-tumoral tissue in which the cytoplasm stained with TTF-1 antibody. Conclusion. - Occasional cytoplasmic staining for TTF-1 in tumors is seen, but it is a nonspecific finding; when present, it should be disregarded for diagnostic purposes.

Original languageEnglish
Pages (from-to)193-195
Number of pages3
JournalArchives of Pathology and Laboratory Medicine
Volume127
Issue number2
StatePublished - Feb 1 2003

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Incidence
Neoplasms
Adenocarcinoma
Staining and Labeling
Lung
Liver
Carcinoma
Large Cell Carcinoma
Small Cell Carcinoma
thyroid nuclear factor 1
Meningioma
Orbit
Tertiary Healthcare
Thigh
Femur
Squamous Cell Carcinoma
Thyroid Gland
Cytoplasm
Breast
Spine

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Medical Laboratory Technology

Cite this

Incidence and significance of cytoplasmic thyroid transcription factor-1 immunoreactivity. / Bejarano, Pablo A.; Mousavi, Fathema.

In: Archives of Pathology and Laboratory Medicine, Vol. 127, No. 2, 01.02.2003, p. 193-195.

Research output: Contribution to journalArticle

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abstract = "Context. - The immunohistochemical identification of thyroid transcription factor-1 (TTF-1) is regarded as the presence of a nuclear pattern of staining and is used to identify tumors of thyroid or pulmonary origin. Although there have been reports of cytoplasmic expression of TTF-1, the significance of this pattern has not been studied in detail. Objectives. - To determine the incidence at which cytoplasmic immunostaining for TTF-1 occurs and to analyze the diagnostic value of this pattern of immunoreactivity. Design. - Histologic sections of 361 consecutive cases of neoplasms stained for TTF-1 were reviewed, and those showing cytoplasmic staining in the tumor cells or in non-neoplastic cells were selected. Clinical correlation was obtained on the latter cases regarding the origin of the tumor. Setting. - An immunohistochemistry laboratory in a tertiary-care institution. Results. - The 361 tumors were obtained from 29 organ sites and corresponded to primary and metastatic neoplasms. Twenty-three (6.3{\%}) tumors showed cytoplasmic staining for TTF-1. In 13 of these, the primary site of origin was established with certainty: 7 were lung carcinomas (3 primary lung adenocarcinomas, 1 primary large cell carcinoma, 1 metastatic small cell carcinoma to the liver, 1 metastatic adenocarcinoma to a neck lymph node, and 1 metastatic adenocarcinoma to thigh soft tissue), 3 colonic adenocarcinomas (2 metastases to vertebrae and 1 to lung), 1 metastatic breast ductal adenocarcinoma to femur, 1 metastatic laryngeal squamous cell carcinoma to liver, and 1 meningioma involving the orbit bone. There were 3 lung carcinomas with concomitant nuclear immunostaining. Nonneoplastic liver tissue was the most frequent non-tumoral tissue in which the cytoplasm stained with TTF-1 antibody. Conclusion. - Occasional cytoplasmic staining for TTF-1 in tumors is seen, but it is a nonspecific finding; when present, it should be disregarded for diagnostic purposes.",
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