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Mesenchymal-Epithelial Transition and Circulating Tumor Cells in Small Cell Lung Cancer

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Part of the book series: Advances in Experimental Medicine and Biology ((AEMB,volume 994))

Abstract

Cancer patients die of metastatic disease but knowledge regarding individual steps of this complex process of intravasation, spread and extravasation leading to secondary lesions is incomplete. Subpopulations of tumor cells are supposed to undergo an epithelial-mesenchymal transition (EMT), to enter the bloodstream and eventually establish metastases in a reverse process termed mesenchymal-epithelial transition (MET). Small cell lung cancer (SCLC) represents a unique model to study metastatic spread due to early dissemination and relapse, as well as availability of a panel of circulating cancer cell (CTC) lines recently. Additionally, chemosensitive SCLC tumor cells switch to a completely resistant phenotype during cancer recurrence. In advanced disease, SCLC patients display extremely high blood counts of CTCs in contrast to other tumors, like breast, prostate and colon cancer. Local inflammatory conditions at the primary tumor site and recruitment of macrophages seem to increase the shedding of tumor cells into the circulation in processes which may proceed independently of EMT. Since millions of cells are released by tumors into the circulation per day, analysis of a limited number of CTCs at specific time points are difficult to be related to the development of metastatic lesions which may occur approximately one year later. We have obtained a panel of SCLC CTC cell line from patients with relapsing disease, which share characteristic markers of this malignancy and a primarily epithelial phenotype with unique formation of large tumorospheres, containing quiescent and hypoxic cells. Although smoking and inflammation promote EMT, partial expression of vimentin indicates a transitional state with partial EMT in these cell lines at most. The CTC lines exhibit high expression of EpCAM , absent phosphorylation of β-catenin and background levels of Snail. Provided that these tumor cells had ever undergone EMT, here in advanced disease MET seem to have occurred already in the peripheral circulation. Alternative explanations for the expression of mesenchymal markers of the CTC lines are the heterogeneity of SCLC cells, cooperative migration or altered gene expression in response to the inflammatory tumor microenvironment allowing for tumor spread without EMT/MET.

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Hamilton, G., Rath, B. (2017). Mesenchymal-Epithelial Transition and Circulating Tumor Cells in Small Cell Lung Cancer. In: Magbanua, M., Park, J. (eds) Isolation and Molecular Characterization of Circulating Tumor Cells. Advances in Experimental Medicine and Biology, vol 994. Springer, Cham. https://doi.org/10.1007/978-3-319-55947-6_12

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