Abstract

The intermediate filament profile of adrenal cortex and its related tumours has been evaluated. Most adrenocortical cells contained cytokeratin 8 and 18 as demonstrated by monoclonal antibodies CAM 5.2, M20, M9 and RGE53. Cytokeratin immunoreactivity was not confined to a functional zone of the adrenal cortex. Only a small number of the adrenocortical cells showed vimentin immunoreactivity. From normal adrenal cortex through adenomas, to carcinomas, there is a progressive decrease or even loss of cytokeratin immunoreactivity and an increase in vimentin immunoreactivity. Aberrant cytokeratin expression was not found in adrenocortical adenomas and carcinomas with the antibodies used. Awareness of the possible absence of cytokeratin immunoreactivity in adrenocortical carcinomas is important whenever antibodies to cytokeratins and vimentin are used for diagnostic purposes in poorly differentiated neoplasms.

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