Modulation of Multidrug Resistance in Human Renal Cell Carcinomas
Intrinsic chemoresistance has major impact on the dismal prognosis of patients with disseminated renal cell carcinoma (RCC) in the absence of reliable therapeutic alternatives . P-170 glycoprotein was identified as a putative mechanism conferring drug resistance. Recently, a high expression of MDR 1 gene mRNA  as well as of P-170 glycoprotein [17–19] was traced in human RCCs, which may partially explain the high degree of de novo resistance. Calcium antagonists (CAs) are substances which interfere with the calcium intake at the cytoplasmatic membrane. They are mainly employed in the treatment of cardiovascular disorders such as hypertension, arrhythmia and angina pectoris. Lately, the interaction of CAs with chemotherapeutics to enhance cytotoxicity has gained particular interest. It has been shown that CAs reverse acquired resistance of experimental animal tumors  to some anticancer drugs and increase the life span of tumor-bearing animals compared to those merely treated with vinca alkaloids .
KeywordsLymphoma Oncol Doxorubicin Verapamil Nifedipine
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