Pathology & Oncology Research

, Volume 16, Issue 1, pp 19–27 | Cite as

High Expression of Claudin-1 Protein in Papillary Thyroid Tumor and its Regional Lymph Node Metastasis

  • Júlia Németh
  • Zsuzsanna Németh
  • Péter Tátrai
  • Ilona Péter
  • Áron Somorácz
  • Attila Marcell Szász
  • András Kiss
  • Zsuzsa SchaffEmail author


Claudins, known as major contributors in the formation of the tight junction, are differentially expressed in malignant tumors as compared to the corresponding healthy tissues. Therefore, they are thought to play a role in carcinogenesis and tumor progression. Altered expression of claudin-1 has been reported in several tumor types including endometrial, papillary renal cell and colonic carcinoma, and increased claudin-1 mRNA levels have been observed in papillary thyroid carcinoma (PTC). In this study, we aimed at determining the pattern of claudin-1 expression in various types of thyroid lesions at the protein level and investigating the immunolocalization of β-catenin reported to regulate claudin-1 expression. Samples included 19 PTCs, ten cases of corresponding regional lymph node metastasis, eight papillary microcarcinomas (PMC), 17 follicular thyroid carcinomas (FTC) and 19 follicular adenomas (FA). All cases were evaluated by quantitative immunohistochemistry. Conspicuous claudin-1 immunostaining was detected in the majority of PTC/PMC primary tumors and lymph node metastases (19/27 and 9/10, respectively). On the other hand, we found weak or no claudin-1 expression in any of the FA and FTC cases or peritumoral non-malignant thyroid tissues. Our data prove that high claudin-1 protein expression is specific for PTC and its regional lymph node metastases, while we failed to verify that claudin-1 is regulated by β-catenin in thyroid tumors. Based on these results, claudin-1 may be a useful tumor marker for PTC.


Claudin-1 Lymph node metastasis Papillary thyroid carcinoma Tumor marker 



Papillary thyroid carcinoma


Papillary microcarcinoma


Follicular thyroid carcinoma


Follicular adenoma


Hashimoto’s thyroiditis


Tight junction



We thank Mrs Magdolna Pekár and Mrs Erzsébet Azumah for preparing the immunohistochemical reactions and Mrs Elvira Rigó Kálé for careful reading and correction of the manuscript. This work was supported by the grant no. 75468 from OTKA (Hungarian Scientific Research Fund).


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Copyright information

© Arányi Lajos Foundation 2009

Authors and Affiliations

  • Júlia Németh
    • 1
  • Zsuzsanna Németh
    • 1
  • Péter Tátrai
    • 1
  • Ilona Péter
    • 2
  • Áron Somorácz
    • 1
  • Attila Marcell Szász
    • 1
  • András Kiss
    • 1
  • Zsuzsa Schaff
    • 1
    Email author
  1. 1.2nd Department of PathologySemmelweis UniversityBudapestHungary
  2. 2.National Institute of OncologyBudapestHungary

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