Immunohistochemistry expression of KI-67, Mcm-2 e HOXB7 in basaloid tumors of head and neck / Estudo da expressão imunoistoquimica de KI-67, Mcm-2 e HOXB7 em neoplasias basaloides de cabeça e pescoço

AUTOR(ES)
DATA DE PUBLICAÇÃO

2010

RESUMO

The aims of this study were to determine the expression of Mcm-2, Ki-67 and HOXB7 in malignant basaloid tumors located in the head and neck region, and to evaluate their usefulness for diagnosis or prediction of tumor behaviour. There were 18 basaloid squamous cell carcinoma (BSCC), 15 squamous cell carcinoma poorly differentiated (SCC-pd), and nine adenoid cystic carcinoma solid type (AdCC-st). Clinicopathological data were collected retrospectively and immunohistochemical analyses of Ki-67, Mcm-2 and HOXB7 were performed on all lesions (n=42). The nuclear stain was considered as positive or negative, and labelling index (LI) for each tumor was determined by counting the percentage of positive cells in six random fields. The mean age of patients was 57 years (±14,5), and the most was male (76%). Ki-67 expression was lower in AdCC-st (LI=18,74% ±8,3, p<0,05) than in BSCC (LI=42,22%) and SCC-pd (LI=43,54) groups. Mcm-2 LI was higher in BSCC (LI=55,57% ±13,4, p<0,05) than in SCC-pd (LI=35,55 ±19,5) and AdCC-st (LI=28,60% ±10,1). A similar result was observed in HOXB7 that showed a higher LI expression in BSCC group (LI=31,28% ±11,6, p<0,05) than in SCC-pd (IM=23,19% ±8,4) and AdCC-st (LI=18,66% ±9,8). It was not possible to establish a correlation between LI and outcome for any of the markers. The present study suggests that Mcm-2 and HOXB7 may be useful for differential diagnosis among BSCC, SCC-pd and AdCC-st. Further studies are needed to assess the value of Mcm-2 and HOXB7 as a predictor of recurrence and survival in malignant basaloid tumors of head and neck region.

ASSUNTO(S)

cell proliferation celulas - proliferação tumors tumores

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