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Hyalinizing trabecular tumour (HTT) of the thyroid is a rare tumour having a prominent trabecular growth pattern and stromal hyalinisation.1 ,2 However, these histologic features can be seen in other thyroid tumours, such as follicular neoplasm, follicular variant of papillary thyroid carcinoma (PTC), medullary thyroid carcinoma (MTC), and primary thyroid paraganglioma.3 ,4 Therefore, HTT should be differentially diagnosed from these other tumour types. When making a diagnosis of HTT, the expression of Ki67 in the cell membrane could be helpful. Principally, Ki67 is used to assess the proportion of a given tumour population that is growing and could be used for the diagnosis or grading of malignant tumours.5 ,6 However, in HTT, Ki67 is characteristically expressed in the cell membrane but not in the nuclei of the tumour cells.7 ,8 Therefore, we evaluated the expression of Ki67 in eight cases of HTT with two types of automated immunohistochemical staining (IHC) systems and a manual method.
This study obtained Institutional Review Board approval, and informed consent was obtained according to the Declaration of Helsinki. Eight cases of HTT and two control cases of MTC were used for this study. The histologic sections were made from the largest cross-sectional area of the tumour, and the IHC was performed with the serially sectioned histologic slides. Antibodies against thyroglobulin, thyroid transcription factor 1 (TTF-1), cytokeratin 19 (CK19), high-molecular weight cytokeratin (HMW-CK), galectin-3, chromogranin A (CgA), synaptophysin, calcitonin, thyroglobulin (TG), and Ki67 were used in the staining processes of a fully automated IHC system with the BOND …