Analise histopatologica e estudo da expressão de PCNA, p53, AgNOR e de metaloproteinases de matriz no basaloide escamoso da cavidade oral

AUTOR(ES)
DATA DE PUBLICAÇÃO

2001

RESUMO

Basaloid squamous carcinoma (BSC) is an uncommon aggressive variant of squamous cell carcinoma (SCC) with a predilection for the head and neck. In the English literature, approximately 40 cases of BSC have been described in the oral cavity. In this study, clinicopathol99ic features of 2 cases of BSC affecting the buccal mucosa are discribed. Additionally, we compared the proliferative and invasive potential of BSC cells with poorly-differentiated SCC, matched for age, sex, site and TNM status. Proliferative activity was studied by the argyrophilic nuclear organizer region (AgNOR) method and immunohistochemical quantification of proliferating cell nuclear antigen (PCNA). The invasive potential was evaluated by semi-quantitative reverse transcriptase-polymerase chain reaction (RT-PCR) for matrix metalloproteinases (MMPs). Alterations of p53 and the presence of laminin were also investigated by immunohistochemistry. The tumors showed many clinical and histopathologic similarities to cases previously reported. The AgNOR and PCNA indices were significantly higher in both cases of BSC than in SCC. Immunostaining for the p53 protein showed a higher percent of positive cells, and more intense staining in the BSC than in the SCC tissues. RT-PCR studies clearly demonstrated that the expression of MMP-1, MMP-2, and MMP-9 were higher in cells from BSCs than from SCCs. Taken together, the data described here are compatible with the concept that BSC has a more aggressive biologic behavior than the conventional SCC

ASSUNTO(S)

celulas - proliferação

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