Utility of tissue microarrays MIB-1 for profiling prognostic biomarkers in clinically localized prostate cancer / Expressão imuno-histoquímica do MIB-1 como fator prognóstico em pacientes com adenocarcinoma de próstata localizado

INTRODUCTION AND OBJECTIVE: To analyze the immuno-histochemical expression of MIB-1 marker as a prognostic factor in patients with localized prostate neoplasia. METHODS: Analysis of 100 cases of patients with localized prostate neoplasia who underwent curative surgery from January 2000 to December 2006. The customary histological preparation was carried out, followed by immunohistochemical reaction to detect MIB-1 protein accumulation and statistical analysis. RESULTS: There was a larger proportion of negative expression for MIB-1 marker (63.0 percent, p < 0.0001). Patients with positive expression (MIB-1 positive) had higher PSA (PSA > 10 ng/dl) (p = 0.010), higher Gleason score (> 7) (p = 0.0003) and pathological stage pT2c (p = 0.001). In the comparison of variables, it was noticed that patients with positive expression had a higher mean PSA (p = 0.031), higher Gleason score (p < 0.0001), longer follow-up (p = 0.037), larger area of vascular proliferation (p < 0.0001) and higher proportion of tumor in relation to normal area (p = 0.012). CONCLUSION: MIB-1 proved to be a prognostic factor comparable to PSA, Gleason and staging.

INTRODUÇÃO E OBJETIVO: Analisar a expressão imuno-histoquímica do marcador MIB-1 como fator prognóstico em pacientes com neoplasia de próstata localizada. MÉTODOS: Análise de cem casos de pacientes portadores de neoplasia prostática localizada submetida a cirurgia curativa no período de janeiro de 2000 a dezembro de 2006. Realizou-se o preparo histológico habitual seguido de reação imuno-histoquímica para a detecção do acúmulo da proteína MIB-1 e análise estatística. RESULTADOS: Obteve-se maior proporção de expressão negativa ao marcador MIB-1(63 por cento, p < 0,0001). Os pacientes com expressão positiva (MIB1 positivo) apresentaram antígeno prostático específico (PSA) mais elevado (PSA > 10 ng/dl) (p = 0,01), escore de Gleason mais alto (> 7) (p = 0,0003) e estádio patológico pT2c (p = 0,001). Na comparação das variáveis observou-se que os pacientes com expressão positiva apresentaram PSA médio mais elevado (p = 0,031), escore de Gleason mais alto (p < 0,0001), maior tempo de seguimento (p = 0,037), maior área de proliferação vascular (p < 0,0001) e maior proporção de tumor em relação à área normal (p = 0,012). CONCLUSÃO: O MIB-1 mostrou-se um fator prognóstico comparável a PSA, Gleason e estádio.

A Study about Peritumoral Brain Edema in Meningiomas using Angiographic Pattern and MIB-1

OBJECTIVE: Peritumoral brain edema(PTBE) accounts for approximately 60% of meningiomas. It has not been identified why vasogenic edema, frequently shown in intra-axial tumors is also developed in extra-axial tumor such as meningiomas. Therefore, the authors assess the peritumoral brain edema of meningiomas with a focus on the angiographic pattern and expression of MIB-1 to clarify their correlation. METHODS: A total 32 cases of meningioma was studied. The authors attempted to identify 1) the location of PTBE and the edema index (EI), 2) the location and dominancy of pial supply compared with meningeal supply, 3) the biological activity of meningiomas indicated by the MIB-1 LI (labeling index), 4) their interaction. RESULTS: No PTBE was observed in the meningiomas without pial arterial supplement from internal carotid artery (ICA) and vertebral artery (VA). The PTBE of meningiomas with pial supply was developed intensely along the pial arterial supplement, and increased statistically in proportion to the extent of pial supply from ICA or VA rather than meningeal supply. Also, the MIB-1 LI in meningiomas tended to be larger in the tumors of the larger EI and the dominancy of pial supply. CONCLUSION: A strong correlation is found between the extent of PTBE in meningiomas and the dominancy of pial supply. The MIB-1 LI also tend to be associated with the PTBE. Therefore, the MIB-1 LI in benign meningiomas may represent not only the proliferative potential of the tumor, but also the biological activity like angiogenesis.