Discerning malignancy in resected adrenocortical neoplasms

Area of Science:

• Surgical Pathology
• Endocrinology
• Oncology

Background:

• Accurate differential diagnosis between adrenocortical adenoma and carcinoma is critical but challenging in surgical pathology.
• Small adrenocortical tumors often lack clear signs of malignancy, complicating diagnosis.
• Increased detection of small adrenocortical neoplasms is due to advanced imaging techniques like CT and MRI.

Purpose of the Study:

• To address the diagnostic difficulties in differentiating benign adenomas from malignant carcinomas in human adrenocortical neoplasms.
• To identify reliable methods for assessing the biologic behavior and malignancy of resected adrenocortical tumors.

Main Methods:

• Histopathologic evaluation using a multivariate scoring system.
• Assessment of neoplastic cell proliferation via immunostains for cell cycle-associated nuclear antigens, specifically Ki-67.

Main Results:

• No single parameter is sufficient for the differential diagnosis of resected adrenocortical tumors.
• Multivariate scoring systems are considered most effective for discerning malignancy and biologic behavior.
• Increased cell proliferation is a consistent molecular and cellular finding in adrenocortical carcinoma.

Conclusions:

• Ki-67 immunostaining, evaluating neoplastic cell proliferation, is the only currently useful auxiliary method for assessing malignancy in resected adrenocortical neoplasms.
• This method aids in the challenging differential diagnosis, particularly for small adrenocortical tumors.