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Original Article Galectin-3 and Thyroid Peroxidase Expression in Thyroid Nodules.
Gyu Hwan Bae, Hyun Dae Yoon, Jong Yup Bae, Ho Sang Son, Eui Dal Jung, Sung Pyo Hong, Myung Hwan Kim, Sun Ah Lee, Hyun Sook Kim, Sun Young Ahn
Endocrinology and Metabolism 2007;22(2):105-111
DOI: https://doi.org/10.3803/jkes.2007.22.2.105
Published online: April 1, 2007
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1Department of Internal Medicine, Daegu Catholic University College of Medicine, Korea.
2Raphael Internal Medicine Clinic, Korea.

BACKGROUND
The accurate diagnosis of a thyroid nodule is important in deciding a patient's treatment plan and for predicting the prognosis. The histopathological diagnosis of resected specimens are largely positively accomplished, but the consistency of the diagnosis is low when the specimen shows a small carcinomatous cytological feature or the nodule does not express papillary proliferation. Therefore, the need for supplementary diagnostic measures is increased. Herein, the expressions of galectin-3 and thyroid peroxidase (TPO) of resected specimens were investigated using immunohistochemical staining, and their potential for contributing to an accurate diagnosis studied. METHODS: The specimens included 195 resected thyroid nodules obtained from 179 patients having undergone thyroid surgery. Immunohistochemical staining for two useful antibodies, galectin-3 and TPO, were performed, and the expressions of these two antibodies investigated with regard to the histological diagnosis. RESULTS: The sensitivity, specificity, and positive and negative predictive values of galectin-3 and TPO for detecting papillary carcinomas were all 100%, but these values were low for other forms of carcinoma. CONCLUSION: Our data showed the diagnosis of thyroid nodules, using immunohistochemical staining for galectin-3 and TPO, was very useful for detecting thyroid papillary carcinoma, but insufficiently sensitive for follicular carcinoma. Immunohistochemical staining for TPO is also useful for distinguishing cases when a false positive result for galectin-3 is obtained.

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