Investigating the role of minichromosome maintenance protein 2 in differentiating follicular adenoma from follicular carcinoma of thyroid

Mahmood Akhavan Tafti, Zahra Kargar, Shokouh Taghipour zahir, Mehrdad Roozbeh, Somayeh Zabihi Mahmoodabadi, Aliasghar Kheirkhah Vakilabad, Farzan Safi Dahaj

Abstract


Thyroid nodules are often discovered incidentally in the clinical practice. Even though definite preoperative diagnosis of follicular thyroid lesions prevents unnecessary thyroid surgeries, fine needle aspiration (FNA) cannot definitely differentiate benign or malignant follicular lesions of the thyroid. Several proliferative markers including minichromosome maintenance proteins (MCM) have been evaluated for diagnosis of follicular lesion. In this study, the immunohistochemical expression of MCM2 in follicular adenoma and carcinoma of thyroid was investigated to determine whether it can distinguish between them and if there is a difference between follicular carcinomas diagnosed with capsular/vascular invasion. The correlation between intensity of MCM2 expression in follicular adenoma and carcinoma was evaluated. Thirty cases of follicular carcinoma and thirty cases of follicular adenoma were obtained from pathology department in Yazd, Iran from 2005 to 2015. We subdivided the follicular carcinomas into three groups on the basis of vascular and capsular invasion. The data were analyzed using SPSS v. 16 and p-value<0.05 was considered meaningful. In this study, the average intensity of MCM2 expression was 73.16% in adenoma and 70.31% in carcinoma which was equally distributed in the invasion area of carcinoma and subcapsular area of adenoma. There is no meaningful relationship between marker expression of MCM2 and gender nor age. MCM2 expression in the thyroid follicular carcinoma is not significantly more than the MCM2 expression in follicular adenoma. MCM2 cannot be used for cytology diagnosis before surgical operations nor for confirming or ruling out histopathologic suspicious cases.

Keywords


Thyroid Carcinomas, Follicular Adenoma, Minichromosome Maintenance Proteins

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References


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