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Ito, Y. et al.

Ito, Nakamura, Yoshida, Tomoda, Uruno, Takamura, Miya, Kobayashi, Matsuzuka, Kuma, Kakudo, Miyauchi,

Polo-like kinase 1 expression in medullary carcinoma of the thyroid: its relationship with clinicopathological features.

OBJECTIVE: Polo-like kinase 1 (PLK1) is one of the serine-threonine kinases that contributes to cell mitosis and is regarded as a marker of cellular proliferation. However, its protein expression in human carcinoma has not been studied in depth. In this study, we investigated PLK1 expression in medullary thyroid carcinoma by means of immunohistochemistry. METHODS: We immunohistochemically investigated PLK1 expression in 67 cases of medullary thyroid carcinoma. RESULTS: The PLK1 expression level was elevated in 43 of the 67 cases (64.1%). Furthermore, the expression level was directly linked to lymph node metastasis, advanced stage and male sex. All patients who were negative for PLK1 expression are currently alive without tumor recurrence, while 6 of the 43 PLK1-positive patients showed recurrence and 3 have already died of this disease. CONCLUSIONS: These findings suggest that PLK1 expression significantly reflects aggressive characteristics of medullary thyroid carcinoma.[1]

References

Polo-like kinase 1 expression in medullary carcinoma of the thyroid: its relationship with clinicopathological features. Ito, Y., Nakamura, Y., Yoshida, H., Tomoda, C., Uruno, T., Takamura, Y., Miya, A., Kobayashi, K., Matsuzuka, F., Kuma, K., Kakudo, K., Miyauchi, A. Pathobiology (2005) [Pubmed]

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