In Situ Hybridization Analysis of miR-146b-5p and miR-21 in Thyroid Nodules: Diagnostic Implications

Endocrine Pathology
Zhenying GuoRicardo V Lloyd

Abstract

Some thyroid nodules such as follicular adenomas (FAs), follicular variant of papillary thyroid carcinomas (FVPTCs), and follicular thyroid carcinomas (FTCs) exhibit similar clinical presentations and gross morphologic appearances. The differential diagnosis of these lesions is sometimes difficult based on morphologic, cytologic, or clinical features alone. miR-146b-5p and miR-21 deregulation has been associated with progression and metastasis of thyroid cancers. However, the utility of in situ hybridization (ISH) to determine the cellular localization, diagnostic, and prognostic significance of miR-146b-5p and miR-21 expression in thyroid tumors has not been extensively analyzed. In order to examine the expression of miR-146b-5p and miR-21 in benign and malignant thyroid tissues and to determine if these microRNAs could be assigned to distinct histomorphological types of thyroid nodules, we analyzed miR-146b-5p and miR-21 expression in thyroid nodules on tissue microarrays (TMAs) with 193 thyroid specimens by ISH. miR-146b-5p and miR-21 expression in thyroid tissues was also analyzed by quantitative reverse transcription-polymerase chain reaction (qRT-PCR). miR-146b-5p was highly expressed (89%) in papillary thyroid carcinomas...Continue Reading

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