P53 and bcl-2 immunoexpression in patients with oral lichen planus and oral squamous cell carcinoma.

OBJECTIVE: The aim of this study was to determine by immunohistochemistry the presence and significance of p53 and bcl-2 proteins in oral lichen planus (OLP) and oral squamous cell carcinoma (OSCC). STUDY DESIGN: We used 21 cases diagnosed as OLP 16 diagnosed as OSCC and four normal gingival biopsies taken from healthy patients were used as controls. Slides were processed for immunohistochemistry using anti-p53 and anti-bcl-2 monoclonal antibodies. RESULTS: We found p53 immunoexpression in 71.4% OLP cases and 68.7% OSCC cases, with no immunoexpression in control cases. Bcl-2 was negative for all OLP and OSCC cases, and mild positivity was observed in normal tissue. We found significant correlation among p53 expression and OSCC malignancy. CONCLUSIONS: Our results suggest that TP53 system mainly promotes a hyperproliferative state by cell cycle arrest of the OLP epithelial cells for repairing damaged DNA nor apoptosis and that anti-apoptotic action of bcl-2 is not important in this disease.

Fibrolipomas de cavidad oral: tumores comunes en sitios poco frecuentes: reporte de dos casos y revisión de la literatura / Oral fibrolipoma: unusual presentation of common tumors: report of two cases and review

Los lipomas son tumores mesenquimales benignos compuestos por adipocitos maduros. Corresponden a casi el 50% de los tumores de tejidos blandos, presentes entre el 1 y 5% en cavidad oral, especialmente en mucosa yugal, piso de la boca y márgenes laterales de la lengua. Suelen ser asintomáticos y su color depende del espesor de la mucosa que lo cubre. Histológicamente están conformados por lóbulos de adipocitos maduros rodeados por una cápsula fibrosa. Las variedades histológicas están determinadas por el tejido adicional que contienen; los más frecuentes son el lipoma simple y el fibrolipoma. Su curso es benigno y el tratamiento consiste en la escisión quirúrgica. En el presente artículo se reportan dos casos de fibrolipoma, un tumor común en una localización poco frecuente.

Lipomas are benign mesenchymal tumors of mature adipocytes. They correspond to almost 50% of soft tissue tumors, 1 to 5% of them localized in the oral cavity, especially in the oral mucosa, floor of mouth and lateral edges of the tongue. Oral lipomas are usually asymptomatic and the color depends of the thickness of the overlying mucosa. Histologically there are lobules of mature adipocytes surrounded by a fibrous capsule, and there are several types according to the additional tissue, being the most frequent the single lipomas and fibrolipomas. The course is benign and the definitive treatment is surgical excision. This article reports two cases of fibrolipoma, a common tumor in an unusual presentation.