We aimed to evaluate the expression and diagnostic value of five immunohistochemical markers (HBME-1, Galectin-3, CK19, CD56 and p63) in a very large series of unequivocal papillary thyroid carcinoma (PTC) cases, including both the classic (CPTC) and the follicular variant (FVPTC). We performed an immunohistochemical analysis on a tissue micro-array of 204 PTCs (98 CPTCs, 90 FVPTCs, and 16 other variants). HBME-1 was the most sensitive marker, staining 95.9% of CPTCs and 81.1% of FVPTCs. CD56, a marker whose expression is reduced or absent in thyroid carcinoma, revealed a negative, "malignant" profile in 93.9% of CPTCs and 73.3% of FVPTCs. Galectin-3, CK19 and p63 were positive in 64.7%, 45.6% and 6.9% of PTCs, respectively. The immunopanel consisting of HBME-1, CD56 and/or CK19 reached the highest sensitivity (95.6%). The co-expression of 2 or more proteins was observed in 88.2% of PTCs, with HBME-1 and CD56 being the most frequent positive association (79.4%). We report a new panel of antibodies consisting of HBME-1, CK19 and CD56 that was found to be highly sensitive for both CPTC and FVPTC. This panel could be recommended as a supplement to the morphological criteria in the diagnosis of difficult FVPTC cases.

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http://dx.doi.org/10.1016/j.prp.2013.06.012DOI Listing

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Article Synopsis
  • The study investigates the role of Immunohistochemistry (IHC) markers (CD56, HBME-1, CK19) in diagnosing malignant thyroid neoplasms, highlighting the challenges of distinguishing between benign and malignant lesions using traditional histopathology.
  • Out of 60 thyroid specimens analyzed, 68.33% were found malignant, with significant loss of CD56 expression in malignant cases and high specificity for CK19 in differentiating follicular neoplasms.
  • The research underscores the importance of incorporating IHC markers to improve diagnostic accuracy for thyroid cancers, particularly in cases of follicular variant papillary thyroid carcinoma and follicular thyroid carcinoma.
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