University of Oulu

Tight junction proteins and cancer-associated fibroblasts in ameloblastoma, ameloblastic carcinoma and mobile tongue cancer

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Author: Bello, Ibrahim O.1,2,3
Organizations: 1University of Oulu, Faculty of Medicine, Institute of Dentistry, Department of Diagnostics and Oral Medicine
2University of Oulu, Faculty of Medicine, Institute of Diagnostics, Department of Pathology
3University of Kuopio, Institute of Clinical Medicine, Pathology and Forensic Medicine
Format: ebook
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 1.5 MB)
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Language: English
Published: 2010
Publish Date: 2010-01-12
Thesis type: Doctoral Dissertation
Defence Note: Academic dissertation to be presented with the assent of the Faculty of Medicine of the University of Oulu for public defence in Auditorium 1 of the Institute of Dentistry (Aapistie 3), on 22 January 2010, at 12 noon
Reviewer: Professor Veli-Matti Kosma
Professor Jesper Reibel


Squamous cell carcinoma (SCC) of the mobile tongue is the most common type of cancer of the oral cavity, accounting for 30–40% of oral cancers. It behaves aggressively and almost half of the affected patients still die of the disease despite great advances in its medical and surgical care. Ameloblastomas are the most common clinically significant type of odontogenic tumors, constituting approximately 1% of all cysts and tumors of the jaw. They are benign but locally invasive tumors with a strong tendency to recur after surgery. Ameloblastic carcinoma combines the histological features of ameloblastoma with cytologic atypia irrespective of the presence or absence of metastasis.

The effectiveness of tight junction proteins (claudins 1, 4, 5, 7 and occludin) and cancer-associated fibroblasts (CAFs) as prognostic markers in OTSCC and as markers of malignancy in ameloblastomas was studied. Abundance of CAFs and Claudin 7 derangement was found to be associated with poor disease-specific survival in oral (mobile) tongue cancer. Appearance of CAFs within the epithelial islands of ameloblastoma was found to be a marker of malignancy in the tumor. The prognostic predictability of CAF density, Ki-67 (cell proliferation marker), maspin (tumor suppressor marker) and tumor DNA content (tumor ploidy using image cytometry) in tongue cancers was also tested. CAF density was the only marker strongly predictive of prognosis. In ameloblastomas, α-SMA (for CAFs), Ki-67, epithelial membrane antigen (EMA) and DNA content (using image and flow cytometry) were assessed as markers of ameloblastic carcinoma. Only α-SMA was able to predict ameloblastic carcinoma when found in the epithelial islands. In conclusion, staining for α-SMA and claudin 7 seems to be beneficial for prognostication in tongue cancer, while α-SMA staining may be beneficial in differentiating ameloblastoma from ameloblastic carcinoma.

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Series: Acta Universitatis Ouluensis. D, Medica
ISSN-E: 1796-2234
ISBN: 978-951-42-6083-4
ISBN Print: 978-951-42-6082-7
Issue: 1040
Copyright information: © University of Oulu, 2010. This publication is copyrighted. You may download, display and print it for your own personal use. Commercial use is prohibited.