Endocrine Abstracts

Introduction: Papillary Thyroid Carcinoma (PTC) exhibits activation of MAPK (Mitogen-activated protein kinases) pathway, leading to uncontrolled cellular division and growth. Concomitantly, thyroid tumors exhibit aberrant expression of numerous microRNAs, which are non-coding RNAs that inhibit expression of protein-coding genes. Employing next-generation sequencing (NGS), we revealed comprehensive miRNA profiles of normal thyroid and PTC, and identified putative novel microRNA...

Introduction: Papillary thyroid carcinoma (PTC) is the most common thyroid malignancy where alterations in the RET/PTC–RAS–BRAF signaling pathway and deregulation of microRNA (miRNA) expression are suggested to be major mechanism of pathogenesis. MicroRNAs are small non-coding RNA molecules that recognize specific sequences in 3′UTR of target gene and prevent from its translation. Our recent deep sequencing studies of thyroid tissue transcriptome revealed a put...

Background: Risk of developing papillary thyroid carcinoma (PTC), the most frequent thyroid malignancy, is elevated up to 8.6-fold in the first-degree relatives of PTC patients, what could be explained by polygenic action of low-penetrance alleles. Since the DNA-damaging exposure to ionizing radiation is a known risk factor for thyroid cancer, polymorphisms in DNA repair genes are likely to affect this risk. Among the DNA repair proteins, the ATM–CHEK2–BRCA1 axis see...

We performed the analysis of correlation between gene expression profile of the papillary thyroid cancer PTC tumors and known clinical factors influencing the outcome of the disease. Gene expression profile was assessed on Human Genome U133A array (Affymetrix). We examined tumors samples obtained from 49 patients diagnosed with PTC. For further evaluation we included following factors: sex, age, tumor size, capsule invasion, multifocality, vascular invasion, lymph node and dis...

Aim of the study: Medullary thyroid cancer (MTC) occurs as hereditary and sporadic form. Hereditary type is a consequence of RET proto-oncogene germline mutations also somatic RET mutations are detectable in sporadic MTC tumors. There is a significant relation between site of mutation and the cancer phenotype as well as a clinical course of the MEN 2 Syndrome as a consequence of the different transforming potential of the RET gene mutations. The aim ...

Objectives: Papillary thyroid carcinoma (PTC) is the most common malignancy of the endocrine system. Its heritability is the highest among common cancers, as evidenced by family-based studies. Thyroid hormone receptor β gene (THRB), a known tumor suppressor, is crucial for the proper thyroid function, therefore its polymorphisms are likely to affect the risk for thyroid cancer.Aim of the study: In order to identify alleles that might modify...

Objectives: Recent studies on BRAFV600E mutation, known as initiating event in papillary thyroid carcinoma (PTC) and related to more aggressive clinical course of the disease, revealed its significant influence on gene expression profile suggesting that BRAF(+)PTCs represent a molecular subtype of PTC. However, the human material disables distinction of possible molecular causes of cancer from its effects, unlike the mouse model. The main goal of our project was to find genes ...

We apply the oligonucleotide microarray technology to study the expression profile of differentiated thyroid cancer (DTC) and to select transcripts which differentiate between its subclasses. We use state-of-the-art bioinformatic techniques, based on Support Vector Machines algorithms, to select not only the single ‘solitary’ markers but rather the sets of genes which are taken into account cooperatively to enhance the diagnosis accuracy. Simultaneously, we try to me...

Introduction: BRAFV600E mutation is the most frequent alteration in papillary thyroid carcinoma (PTC). Although its relation to factors of poor prognosis was demonstrated in many studies the use of BRAF as a predictive marker in clinical treatment of PTC patients is controversial. The aim of our study was to analyze molecular consequences of BRAFV600E mutation in a transgenic mouse model performed for this purpose and to refer the obtained results to...