Low Ki-67 gene expression in non-neoplastic proliferation of oral mucosal epithelium

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Janti Sudiono
Irmawati Hassan


Neoplastic and non-neoplastic oral mucosal growths often have a variety of clinical manifestations according to their biological nature. Immunohistochemical diagnostic markers, such as Ki-67, are used to detect their proliferation and differentiation. Ki-67 is expressed in all phases of the cell cycle, except G0. The objective of this study was to determine Ki-67 expression in benign, malignant and non-neoplastic proliferation of oral mucosal epithelium.
A laboratory study of cross sectional design was conducted using samples from excised oral mucosa diagnosed as inflammatory gingival hypertrophy (n=5); epulis (n=6); gingival polyps (n=5); pulpal polyps (n=5); papilloma (n=3) and squamous cell carcinoma (n=2). The antigen retrieval endogenous peroxidase
block method was used in the application of Ki-67 primary  antibody and chromogen to display the antigen antibody reaction, with positive  cells showing brown nucleoplasm staining. The Ki-67 positive index was calculated by dividing the number of positive epithelial cells with the total number of epithelial
cells in the areas observed at 400x magnification. One-way ANOVA was used to compare the Ki-67 indexes of neoplastic and non-neoplastic lesions.
The highest Ki-67 positive index was for squamous cell carcinoma (64.55 ± 23.55%) followed by papilloma (23.33 ± 6.94%), gingival polyps (7.06 ± 7.43%) and gingival hypertrophy (1.40 ± 2.80%). One-way ANOVA showed significant differences in Ki-67 expression between neoplastic and non-neoplastic  samples (p<0.05).
The high Ki-67 expression in neoplasms is proportional to the  grade of malignancy. In non-neoplastic processes Ki-67 expression is merely an adaptive response and does not indicate increased Ki-67 proliferative gene expression.

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How to Cite
Sudiono, J., & Hassan, I. (2012). Low Ki-67 gene expression in non-neoplastic proliferation of oral mucosal epithelium. Universa Medicina, 31(3), 159–166. https://doi.org/10.18051/UnivMed.2012.v31.159-166
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