Abstract
Although the incidence is very low, the prognosis of anaplastic carcinoma of the thyroid is very poor regardless of the results of various therapeutic trials. We found that the mechanism of anti-cancer drug resistance in anaplstic carcinoma of the thyroid was not explicable only in terms of expression of the mdrl and its gene product, P-glycoprotein. Therefore, expression of multidrug resistance-associated protein (MRP) mRNA was examined in 11 anaplastic thyroid carcinomas and eight anaplastic thyroid carcinoma cell lines. High MRP mRNA expression was recognized in 7 11 and 8 8 , respectively. Our results may contribute to elucidation of the mechanism of anti-cancer drug resistance in this neoplasm.
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