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• W2000229061 abstract "We evaluated by immunohistochemistry the expression of the Bcl-2 and p53 proteins, as markers of apoptosis control, and of MIB-1, as a marker of cell proliferation, in a series of normal and neoplastic adrenocortical tissues. The specimens were 13 normal adrenals, 13 aldosterone-producing adenomas, 13 non-functioning adenomas and 16 carcinomas. Results were calculated as percentage of immunostained cells by using specific antibodies. No p53 protein was detected in any of the adrenocortical adenomas (functioning and non functioning) or normal adrenals, while p53 was overexpressed in 15 out of 16 carcinomas. In particular, 10 adrenal cancer specimens (62.5%) showed strong staining in a high percentage (range 10-50%) of the malignant cells. The percentage of Bcl-2 positive cells was higher (P<0.05 or less) in non-functioning adenomas (8.1+/-1.9%) and in carcinomas (14.9+/-5.6%) than in normals (2.9+/-0.9%) and aldosterone-producing adenomas (5.3+/-1.3%) since four specimens of the non-functioning adenomas-group (30.7%) and six of the carcinomas-group (37.5%) showed over 10% positivity (cut-off for normal values, set at 90th percentile of our controls). MIB-1 positivity was 0.50+/-0.36% in normals, 0.54+/-0.08% in non-functioning adenomas and 0.54+/-0.08% in aldosterone-producing adenomas. MIB-1 was expressed in all carcinomas with values (13.7+/-3.1%) significantly (P<0.0006) higher than in the other groups. In conclusion, the present data indicate that the apoptosis control and proliferation activity evaluated by the p53 and MIB-1 proteins are impaired in adrenal carcinomas but preserved in adenomas, independently of their functional status. Therefore, these immunohistochemical markers, overexpressed in carcinomas only, may be useful in the diagnosis of malignancy in adrenocortical tumours. Whether Bcl-2 positivity found in some carcinomas and non-functioning adenomas may constitute, in the latter, a negative prognostic marker is still unknown." @default.
• W2000229061 created "2016-06-24" @default.
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• W2000229061 date "2002-05-01" @default.
• W2000229061 modified "2023-10-14" @default.
• W2000229061 title "Apoptosis control and proliferation marker in human normal and neoplastic adrenocortical tissues" @default.
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• W2000229061 doi "https://doi.org/10.1038/sj.bjc.6600287" @default.
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