Abstract
To detect the expression of PTEN, PIP3 and cyclin D1 in oral squamous cell carcinoma and precancerous lesions and analyze their correlation. Immunohistochemistry SP method was used to detect the expression of PTEN, PIP3 and cyclin D1 in 63 cases of oral squamous cell carcinoma, 29 cases of simple hyperplasia, 33 cases of dysplasia, and 25 cases of normal oral mucosa. The negative or low expression of PTEN in oral squamous cell carcinoma was 25%, which was remarkably lower than that in other groups. The positive expression of PIP3 in simple hyperplasia, dysplasia and oral squamous cell carcinoma was 66%, 64%, and 76% respectively, which were much higher than those in normal oral mucosa. The positive expression of cyclin D1 in oral squamous cell carcinoma was 49%, which was significantly higher than that in other groups. The negative correlation between PTEN with PIP3, cyclin D1 and the positive correlation between PIP3 and cyclin D1 were observed. PTEN may play a role in the oncogenesis of oral squamous cell carcinoma, and PTEN may down-regulate the expression of PIP3, and then down-regulate the expression of cyclin D1, which leads to the suppression of cell growth.
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