Objective: In thyroid cytology, ancillary studies are often utilized for intermediate-category cases to better differentiate between benign and malignant lesion. For this purpose, immunocytochemical markers may be preferred because they are cheaper than molecular studies and can be applied in many laboratories. This study retrospectively compares the diagnostic accuracy of cytology samples with and without immunocytochemistry and calculates the frequency of immunocytochemical marker use, as well as sensitivity and specificity rates.
Methods: Between 2015 and 2023, 1816 samples from 1506 patients with a histological diagnosis after cytological examination (thyroidectomy-lobectomy) were included. Cases without a histological diagnosis were excluded. The Thin Prep® method was used for all cytological sample preparations, and cell blocks were obtained. Demographic information, Bethesda system categories, immunocytochemical markers used, and histological diagnoses were recorded. Cases using at least one immunocytochemical marker were re-evaluated, and staining results were categorized as positive, focally positive, or negative. SPSS 15® software was used to assess data normality and perform statistical analyses.
Results: The most frequently used markers were HBME-1 (n=167), CK 19 (n=106), Galectin-3 (n=75), and CD 56 (n=6). Sensitivity rates for HBME-1, CK 19, Galectin-3, and CD 56 were 91%, 94%, 76%, and 75%, respectively; specificity rates were 63%, 61%, 80%, and 50%, respectively. Comparing groups with and without immunocytochemistry, the risk of malignancy was: 6.95%-6.97% for Bethesda category II; 21.7%-19.0% for Bethesda category III; 76.0%-37.1% for Bethesda category IV; 94.0%-95.0% for category V; and 100% for category VI.
Conclusion: In the follicular neoplasm group (Bethesda category IV) the risk of malignancy was higher in the immunohistochemistry applied group. No significant difference in malignancy risk was observed between groups with and without immunocytochemistry in other categories. Considering that immunocytochemical markers were predominantly applied in diagnostically challenging Bethesda categories, the similar malignancy risks across groups may suggest immunocytochemistry aids in accurate categorization. However, according to the results of this study, routine use of immunohistochemical markers in thyroid cytology is unnecessary except for Bethesda category IV.
This study was approved by Ethics Committee of Haseki Training and Research Hospital, Noninvasive Clinic Ethics Committee (Approval date: 23.05.2024.; Number:26-2024)
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Primary Language | English |
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Subjects | Pathology |
Journal Section | Articles |
Authors | |
Early Pub Date | September 30, 2025 |
Publication Date | September 30, 2025 |
Submission Date | September 20, 2024 |
Acceptance Date | September 5, 2025 |
Published in Issue | Year 2025 Volume: 15 Issue: 3 |