Abstract
The aim of this study is to investigate the role of RASSF1A and KRAS protein immunoexpression in Oral Leukoplakia with Epithelial Dysplasia (OLD) and in Oral Squamous Cell Carcinoma (OSCC). Immunohistochemical staining for RASSF1A and KRAS was performed and a semiquantitative analysis was applied to samples of the Control Group (CG, n=20), OLD (n=39), and OSCC (n=100). No significant difference was observed between RASSF1A immunoexpression and OLP and OSCC groups (p>0.05). KRAS expression was higher in OSCC than in OLP and CG (p<0.05). No association was observed between RASSF1A or KRAS expression and alcohol/tobacco use or clinicopathological features (p>0.05) in the OSCC group. Also, patients with OSCC who presented KRAS overexpression had a worse disease-free survival rate (p=0.04). RASSF1A expression was similar in OLD and OSCC groups, suggesting that it plays a critical role in the early stage of OSCC. KRAS expression was higher in OSCC when compared with normal and dysplastic tissues, showing that KRAS expression increases with malignant progression.
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