Eleni Politaki

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Epithelial to mesenchymal transition (EMT) is considered an essential process in the metastatic cascade. EMT is characterised by upregulation of vimentin, Twist, Snail, Slug and Sip1 among others. Metastasis is also associated with the presence of circulating tumour cells (CTCs) and disseminated tumour cells in the blood and bone marrow, respectively, of(More)
PURPOSE To examine the prognostic value of cytokeratin-19 (CK-19) mRNA-positive circulating tumor cells (CTCs) in early-stage breast cancer patients focusing on clinically relevant subgroups based on estrogen receptor (ER) and HER2 expression. PATIENTS AND METHODS CK-19 mRNA-positive CTCs were detected by real-time reverse transcriptase polymerase chain(More)
BACKGROUND We aimed to assess the clinical validity of circulating tumour cell (CTC) quantification for prognostication of patients with metastatic breast cancer by undertaking a pooled analysis of individual patient data. METHODS We contacted 51 European centres and asked them to provide reported and unreported anonymised data for individual patients(More)
Circulating tumor cells (CTCs) have been associated with prognosis especially in breast cancer and have been proposed as a liquid biopsy for repeated follow up examinations. Molecular characterization of CTCs is difficult to address since they are very rare and the amount of available sample is very limited. We quantified by RT-qPCR CK-19, MAGE-A3, HER-2,(More)
CTCs expressing variable levels of epithelial and mesenchymal markers in breast cancer have previously been reported. However, no information exists for keratin expression levels of CTCs in association with disease status, whereas assays for the characterization of transitional EMT phenotypes of CTCs in breast cancer are rather lacking. We investigated the(More)
PURPOSE The aim of this study was to evaluate the clinical relevance of the simultaneous detection of cytokeratin (CK)-19 messenger RNA (mRNA)- and HER2 mRNA-positive cells in peripheral blood of women with early-stage breast cancer. PATIENTS AND METHODS CK-19 mRNA- and HER2 mRNA-positive cells were detected using a real-time and a nested(More)
BACKGROUND The purpose of this study was to evaluate the prognostic value of circulating tumor cells (CTCs) expressing HER2 messenger RNA (mRNA) after the administration of adjuvant chemotherapy in women with operable breast cancer. PATIENTS AND METHODS HER2 mRNA-positive CTCs were detected by nested RT-PCR in the peripheral blood of 214 patients with(More)
Circulating tumor cells (CTCs) have been studied in breast cancer with the CellSearch® system. Given the low CTC counts in non-metastatic breast cancer, it is important to evaluate the inter-reader agreement. CellSearch® images (N = 272) of either CTCs or white blood cells or artifacts from 109 non-metastatic (M0) and 22 metastatic (M1) breast cancer(More)
OBJECTIVES To investigate the effect of pazopanib on different CTCs subpopulations in patients with recurrent SCLC and evaluate their clinical relevance. METHODS Peripheral blood was obtained before the administration of pazopanib (n=56 patients), after the first cycle (n=35 patients) and at disease progression (n=45 patients). CTCs were detected by(More)
BACKGROUND Detection of CTCs is a poor prognostic factor for many cancer types; however, their very low frequency represents an obstacle for their detection. The objective of the current study was to compare the performance of commonly used methods for CTCs isolation. METHODS The evaluated methods using spiking experiments of MCF7, SKBR3 and MDA MB-231(More)