Volume 114, Issue 1 pp. 39-42

Tenascin-C expression in Merkel cell carcinoma lymph node metastasis

VIRVE KOLJONEN

Corresponding Author

VIRVE KOLJONEN

Department of Plastic Surgery, Helsinki University Hospital,

Virve Koljonen, Department of Plastic Surgery, Töölö Hospital, P.O. Box 266, FIN 0029 HUS, Finland. e-mail: [email protected]Search for more papers by this author
TOM BÖHLING

TOM BÖHLING

Department of Pathology, Helsinki University and HUSLAB, and

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ERKKI TUKIAINEN

ERKKI TUKIAINEN

Department of Plastic Surgery, Helsinki University Hospital,

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CAJ HAGLUND

CAJ HAGLUND

Department of Gastroenterological and General Surgery, Helsinki University Hospital, Helsinki, Finland

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TIINA JAHKOLA

TIINA JAHKOLA

Department of Plastic Surgery, Helsinki University Hospital,

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First published: 23 February 2006
Citations: 8

Received 10 April 2005.

Accepted 1 November 2005.

Abstract

Expression of tenascin-C (Tn-C) has been shown to correlate with invasion and metastasis in Merkel cell carcinoma (MCC). Cytokeratin-20 (CK-20) is used in differential diagnostics of the primary tumour. The aim of this study was to demonstrate the expression of Tn-C in MCC lymph node metastases. Immunohistochemical staining was performed for five metastatic lymph nodes using a monoclonal antibody against Tn-C and CK-20. All five metastatic lymph nodes expressed Tn-C. The expression concentrated around the vascular structures, invasion borders and fibrotic septae. One of the metastatic lymph nodes was strongly positive for CK-20 while the others showed a focal or negative pattern. The normal lymphoid tissue was negative for Tn-C. Tn-C detected metastatic MCC tissue within the lymph nodes undisputedly. There was a clear distinction between the metastatic and normal lymphatic tissue. Furthermore, invasion to the surrounding tissue was easily demonstrated. Contrary to previous studies, CK-20 expression seemed to fluctuate.

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