Tumor Biology

, Volume 35, Issue 4, pp 3803–3808 | Cite as

Strong claudin 5 expression is a poor prognostic sign in pancreatic adenocarcinoma

  • Ylermi Soini
  • M. Eskelinen
  • P. Juvonen
  • V. Kärjä
  • K. M. Haapasaari
  • A. Saarela
  • P. Karihtala
Research Article


We investigated the expression of claudin 5 in 88 ductal adenocarcinomas of the pancreas. The results were correlated with patient prognosis, with claudin 5 expression in blood vessels, with the expression level of bcl2 and bax and with apoptosis. Claudin 5 expression was detected in 24 (38 %) cases. It was not associated with tumour size or spread, but strong claudin 5 expression correlated with a worse survival (p = 0.005). Claudin 5 also associated with a higher extent of apoptosis and greater expression of bax protein. In the tumour vasculature, some vessels displayed a loss of claudin 5 expression. The presence of this loss was associated with tumour grade and the presence of nodal metastases (p = 0.02, p = 0.022, respectively). These results indicate that claudin 5 is upregulated in a proportion of pancreatic ductal adenocarcinomas. The association of strong claudin 5 expression with a worse survival is in line with some earlier reports indicating that this protein is involved with increased locomotion and more aggressive spread of carcinomas. The association of claudin 5 with apoptosis and bax might be due to stronger cellular kinetics found in such tumours. The loss of claudin 5 expression in the tumour vasculature points to a leaky vessel type; this might also ease the access of tumours to vessels and be reflected in its association with the presence of nodal metastases.


Pancreas Carcinoma Claudin Apoptosis 



We appreciate the support of the Finnish Anti-Tuberculosis Association and the Finnish Cancer Society.

Conflicts of interest



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Copyright information

© International Society of Oncology and BioMarkers (ISOBM) 2014

Authors and Affiliations

  • Ylermi Soini
    • 1
    • 6
  • M. Eskelinen
    • 2
  • P. Juvonen
    • 2
  • V. Kärjä
    • 1
  • K. M. Haapasaari
    • 3
  • A. Saarela
    • 4
  • P. Karihtala
    • 5
  1. 1.Department of Pathology and Forensic Medicine, Institute of Clinical Medicine, Pathology and Forensic Medicine, School of MedicineUniversity of Eastern Finland, Cancer Center of Eastern FinlandKuopioFinland
  2. 2.Department of Gastrointestinal Surgery, Kuopio University Hospital and School of MedicineUniversity of Eastern FinlandKuopioFinland
  3. 3.Department of PathologyUniversity of OuluOuluFinland
  4. 4.Department of Gastrointestinal SurgeryOulu University HospitalOuluFinland
  5. 5.Department of Oncology and RadiotherapyUniversity of Oulu and Oulu University HospitalOuluFinland
  6. 6.Department of Pathology and Forensic Medicine, School of MedicineUniversity of Eastern FinlandKuopioFinland

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