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An immunohistochemical study of pheochromocytomas
Archives of Pathology & Laboratory Medicine
|July 1, 1984
Summary
Neuron-specific enolase (NSE) is present in all adrenal pheochromocytomas, aiding diagnosis. This marker helps differentiate adrenal medullary tumors from cortical ones, including in difficult cases.
Area of Science:
- Endocrinology
- Oncology
- Pathology
Background:
- Pheochromocytomas are tumors of the adrenal medulla.
- Accurate diagnosis and differentiation from adrenal cortical tumors are crucial.
Purpose of the Study:
- To investigate the immunohistochemical expression of neuron-specific enolase (NSE) in various types of pheochromocytomas.
- To assess the utility of NSE as a diagnostic marker for adrenal medullary tumors.
Main Methods:
- Immunohistochemical analysis of 26 adrenal pheochromocytomas and 4 normal adrenal medullae.
- Study included malignant tumors, tumors in patients with neurofibromatosis and multiple endocrine neoplasia type 2, and sporadic tumors.
Main Results:
- Neuron-specific enolase (NSE) was detected in all studied pheochromocytomas (benign and malignant) and normal adrenal medullae.
- Methionine enkephalin-like immunoreactivity was also widespread.
- Corticotropin-like immunoreactivity was focally present in some normal medullae and benign tumors.
- NSE was negative in all normal adrenal cortex and adrenal cortical tumors, proving useful in differential diagnosis.
Conclusions:
- Neuron-specific enolase (NSE) is a reliable marker for pheochromocytomas, irrespective of malignancy or specific genetic associations.
- NSE is valuable in distinguishing adrenal medullary tumors from adrenal cortical tumors, particularly in challenging cases.