MicroRNA expression patterns in adrenocortical carcinoma variants and clinical pathologic correlations

Area of Science:

• Endocrinology
• Oncology
• Molecular Biology

Background:

• MicroRNAs (miRNAs) are implicated in adrenocortical carcinoma (ACC) development.
• Limited data exists on miRNA expression in ACC histologic variants and their clinical correlation.

Purpose of the Study:

• To evaluate the expression of five selected miRNAs (miR-483-3p, miR-483-5p, miR-210, miR-195, miR-1974) in ACC histologic variants.
• To correlate miRNA expression with clinicopathologic features and prognostic markers.

Main Methods:

• Expression analysis of five miRNAs in 51 ACC samples (35 classical, 6 myxoid, 10 oncocytic).
• Comparison with clinical, pathological, and immunohistochemical data (steroidogenic factor 1, p53, β-catenin, glucose transporter 1, Ki-67).
• Statistical analysis including univariate and multivariate survival analyses.

Main Results:

• Oncocytic carcinomas showed reduced expression of miR-483-3p, miR-483-5p, and miR-210 compared to other histotypes.
• High miR-210 expression was linked to necrosis, elevated Ki-67 index, and increased glucose transporter 1.
• High miR-210 was associated with shorter overall survival, while high mitotic index was the sole independent prognostic factor.

Conclusions:

• miR-483-3p, miR-483-5p, and miR-210 exhibit differential expression in ACC variants.
• Elevated miR-210 levels are indicative of aggressive clinicopathologic parameters and portend a poorer prognosis in ACC.