PATHOLOGY & ONCOLOGY RESEARCHVol. 10 No. 2, 2004

 Article

The Role of TTF-1 in Differentiating Primary and Metastatic Lung Adenocarcinomas

Judit MOLDVAY1, M JACKEL2, K BOGOS3, I SOLTÉSZ3, L AGÓCS3, G KOVÁCS3, Zsuzsa SCHAFF2

1County Hospital of Pulmonology, Törökbálint, Hungary
22nd Institute of Pathology, Semmelweis University, Budapest, Hungary
3National Korányi Institute of Pulmonology, Budapest, Hungary

 

Thyroid transcription factor-1 (TTF-1) is a sensitive marker for pulmonary and thyroid adenocarcinomas. The aim of this work was to determine its usefulness in distinction between primary and metastatic lung adenocarcinomas. We have examined the expression of TTF-1 in 100 solitary pulmonary nodules. They included 50 stage I peripheral primary bronchial adenocarcinomas (30 men, 20 women, mean age: 60 years) and 50 metastatic pulmonary adenocarcinomas (21 men, 29 women, mean age: 57 years) of different origins, such as breast (13), colon (13), rectum (13), kidney (7), stomach (2), and thyroid gland (2). TTF-1 immunohistochemistry was performed on formalin-fixed, paraffin-embedded tissues. In primary bronchial adenocarcinomas we found immunopositivity in 46/50 cases, among them 30 cases showed strong nuclear immunostaining. In four primary adenocarcinoma cases the observed immunopositivity was localized to the cytoplasm. Out of the metastatic adenocarcinomas all but the 2 thyroid cancers were negative. Both thyroid tumors showed strong immunopositivity. Our results confirm that TTF-1 immunohistochemistry is a very sensitive and highly specific method in the differential diagnosis of primary and metastatic lung adenocarcinomas and should be used in the everyday clinical practice. Pathology & Oncology Research, Vol 10, Nr 2, 85-88, 2004

Key words: TTF-1; immunohistochemistry; lung adenocarcinoma; metastasis


Received: Apr 26, 2004; accepted: May 18, 2004
Correspondence: Judit MOLDVAY, County Hospital of Pulmonology, , Munkácsy M. u. 70. Törökbálint 2045, Hungary; Tel: 36 23 511 570, Fax: 36 23 334 837; E-mail: drmoldvay@hotmail.com

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