Abstract
CD10/neutral endopeptidase 24.11(NEP) is a membrane-bound zinc metalloproteinase the expression of which represents a useful tool in the classification and diagnosis of malignant leukemia and lymphoma. Recently, CD10 has been found to be expressed in nonhematopoietic tissues and various types of neoplasms. In this study, we examined CD10 immunostaining in paraffin sections of 70 distinct lesions to investigate whether CD10 is a useful diagnostic marker for thyroid neoplasms. CD10 was not detected in normal thyroid tissue, benign lesions (15 follicular lesions and 15 adenomatous goiters), and pure papillary carcinomas except for follicular variants. In contrast, CD10 was expressed in 8 of 10 (80%) follicular carcinomas and 7 of 9 (77%) follicular variant of papillary thyroid carcinomas. This appears to be the first report on the expression of this member of a newly identified gene family in thyroid tumors. In conclusion, immunohistochemistry of CD10 in paraffin sections is valuable in the classification of thyroid follicular lesions into benign and malignant groups and in the diagnosis of follicular variant of papillary thyroid carcinoma.
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