MOLECULAR-BIOLOGICAL THYROID PROFILE DURING AUTOIMMUNE DISEASE - HASHIMOTO AND RIEDEL'S THYROIDITIS.

: Investigated 62 sample of thyroid gland obtained after surgical intervention, including: HT (n=27), RT (n=9), Graves' disease (n=17) and papillary thyroid carcinoma (n = 10). The slides were studied using classical histological and immunohistochemical methods: H&E, TTF1, TSH, S100-protein, CD56 and p63. Dispite of the histological and immunohistochemical heterogeneity of Thyroiditis HT and RT, the progressive involution of the glandular tissue with the replacement by the sever fibrosis, in some cases by the scar tissue is observed as damage sign. In Hashimoto thyroiditis, the foci of follicular epithelium dysplasia were determined, with p63 positive and CD56 negative reactions. Graves' disease is characterized by high TSH expression as well as lymphoproliferation with the formation of large fused nodules with germinative centers. With Riedel's thyroiditis, there is a moderate expression of TTF-1 in the stroma and capillary endotheliocytes, as well as diffuse-focal moderate expression of S100 protein in cells of neuroectodermal population. The reaction to malignant transformation markers - CD56 and p63 - in the tissue of Thyroid gland with Thyroiditis, Riedel was definitely negative.