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ORIGINAL ARTICLE
Year : 2016  |  Volume : 7  |  Issue : 4  |  Page : 493-499

A study of Ki-67 expression and its clinicopathological determinants in nondysplastic oral leukoplakia


1 Department of Pathology, North Bengal Medical College and Hospital, Darjeeling, West Bengal, India
2 Department of Oral Pathology, North Bengal Dental College and Hospital, Darjeeling, West Bengal, India

Correspondence Address:
Krishnendu Mondal
C/o. Barendra Nath Mondal, Village.Fularhat, P.O. and P.S. Sonarpur, South 24 Parganas, Kolkata - 700 150, West Bengal
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0976-237X.194106

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Context: Oral cancer is the third most prevalent malignancy in India. Leukoplakia is its most common precursor lesion. Aims: This study aimed at evaluation of the Ki-67 expression and thereby detection of the dysplastic potential in histopathologically nondysplastic oral leukoplakia (OL). Secondarily, another purpose was to correlate various clinicopathological factors with the labeling indices (LIs) of Ki-67 in those cases as well. Settings and Design: In total, 97 OL cases were examined. Relevant clinical and demographic information was retrieved from the pro forma, prefilled by the patients themselves during their first visit. Subjects and Methods: Ki-67 immunohistochemical staining was performed on paraffin-embedded tissue samples. Its LIs were calculated and correlated with different clinicopathological parameters using statistical software SPSS version 16.0. Results: 58.8% (57 cases) lesions exhibited a Ki-67 positivity of ≤5%, and 25.8% (25 cases) lesions exhibited it in the range of 6%–25%. Only 15 (15.4%) patches were stained positively between 26% and 60%. Patients' age beyond 50 years, nonhomogeneous leukoplakia, and tobacco addiction were the significant risk factors for high Ki-67 scores (P < 0.05). Conclusions: Ki-67 is an essential immunohistochemical marker for epithelial dysplasia in OL, especially when the conventional histopathology fails to appreciate the same. In this purpose, Ki-67 labeling on a routine basis delivers the most convenient results for patients aged above 50 years, and/or addicted to tobacco products, and/or suffering from nonhomogeneous patches.


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