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Journal of Histochemistry and Cytochemistry, Vol. 50, 1371-1380, October 2002, Copyright © 2002, The Histochemical Society, Inc.

ARTICLE

{alpha}vß6 Integrin-A Marker for the Malignant Potential of Epithelial Ovarian Cancer

Nuzhat Ahmeda,b, Clyde Rileya, Gregory E. Ricea,b, Michael A. Quinna,b, and Mark S. Bakera
a Gynaecological Cancer Research Centre, The University of Melbourne and Royal Women's Hospital, Carlton, Victoria, Australia
b Department of Obstetrics and Gynaecology, The University of Melbourne and Royal Women's Hospital, Carlton, Victoria, Australia

Correspondence to: Nuzhat Ahmed, Gynaecological Cancer Research Centre, Royal Women's Hospital, 132 Grattan Street, Carlton, Victoria 3053, Australia. E-mail: nuzhata@unimelb.edu.au

The mechanism(s) responsible for the progression of non-metastatic or borderline ovarian cancer to invasive Grade I/III ovarian cancer is still unknown. An epithelium-restricted integrin, {alpha}vß6, is present in malignant epithelia but not in normal epithelia. We studied the relative expression and distribution of {alpha}vß6 integrin in early and late-stage invasive (Grade I and Grade III) and non-invasive (benign and borderline) ovarian tumors of serous, mucinous, endometrioid, and clear-cell carcinoma subtypes, to assess its potential as a marker for epithelial ovarian cancer progression. Sixty-six specimens, including eight normal, 13 benign, 14 borderline, 13 Grade I, and 18 Grade III tumors were evaluated by immunohistochemistry (IHC) using a monoclonal antibody (MAb) against {alpha}vß6 integrin. Normal ovarian surface epithelium was negative for {alpha}vß6 integrin expression. All 45 carcinomas studied were positive, and the staining intensity significantly correlated with the grade of the tumor. The Grade III carcinomas of all types showed strong staining intensity. Only mucinous benign tissues were positive, and no reactivity was observed in benign serous neoplasms. On the basis of these observations, we hypothesize that the expression of {alpha}vß6 integrin is associated with epithelial ovarian cancer and that a gradual increase in the expression of the molecule may be a correlative index of the progression of this disease.

(J Histochem Cytochem 50:1371–1379, 2002)

Key Words: {alpha}vß6 integrin, epithelial cells, ovarian cancer, metastasis


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