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Poorly differentiated thyroid carcinoma (PDTC) and anaplastic thyroid carcinoma (ATC) are the most aggressive forms of thyroid cancer. Despite their low incidence, they account for a disproportionate number of thyroid cancer-related deaths because of their resistance to most therapeutic approaches. We have generated mouse models that develop ATC ([Pten, p53](thyr-/-) mice) and follicular thyroid cancer with areas of poor differentiation (Pten(thyr-/-),Kras(G12D) mice). Comparative gene expression profiling of human and mouse ATCs reveals a common "mitotic signature" in which mitotic kinases, including Polo-like kinase-1 (PLK1), are found deregulated in both species. Most genes from this signature are also upregulated in poorly differentiated tumors developing in Pten(thyr-/-),Kras(G12D) mice. PLK1 is a crucial driving force for normal mitotic spindle formation, centrosome maturation, and separation, and its overexpression has been demonstrated in a wide range of tumors.

thyroid

The PLK1 Inhibitor GSK461364A Is Effective in Poorly Differentiated and Anaplastic Thyroid Carcinoma Cells, Independent of the Nature of Their Driver Mutations