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• W348248533 abstract "Background We sought to determine how often P‐glycoprotein is involved in the drug‐resistance of urothelial cancer, and whether MDR1 gene expression is correlated with tumor grade, invasiveness, or metastasis. Methods Forty‐two tumor specimens and two normal bladder mucosal samples obtained from 34 urothelial cancer patients were analyzed. Reverse‐transcription and polymerase chain reaction were conducted. MDR1 mRNA levels were determined by measuring the relative ratio of the MDR1 to beta‐2‐microglobulin ( b2 m ) mRNA specific PCR products. Results The MDR1/b2 m in two normal urothelial samples were 0.044 and 0.045. For untreated primary tumors, levels of MDR1 gene expression in 46% tumor samples were less than that of normal urothelium, while 27% showed expression levels with a MDR1/b2 m ratio more than 0.1. There was no statistical correlation between MDR1 mRNA level and tumor grade, stage, or metastatic status. There was higher MDR1 gene expression in two lymph node metastasis specimens and almost equal expressions in two more. There was no significant difference in the mean MDR1/b2 m ratio between postchemotherapy and untreated tumors. A remarkable elevation of the MDR1 mRNA level (15 times greater than prechemotherapy) was found in one tumor; mRNA levels of the multidrug resistance‐associated protein ( MRP ) gene, glutathione S‐transferase π ( GST‐π ) gene or DNA topoisomerase II ( topo II ) gene did not increase. Conclusions It is still unclear whether the MDR1 gene expression in urothelial tumor cells is inducible by the current combination chemotherapy regimens. RT‐PCR quantitation is useful for determining the expression level of MDR1 gene in urothelial cancer." @default.
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• W348248533 date "1995-11-01" @default.
• W348248533 modified "2023-09-26" @default.
• W348248533 title "COMPARISON OF MULTIDRUG RESISTANCE GENE EXPRESSION LEVELS WITH MALIGNANT POTENTIALS AND INFLUENCE OF CHEMOTHERAPY IN UROTHELIAL CANCERS" @default.
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• W348248533 doi "https://doi.org/10.1111/j.1442-2042.1995.tb00005.x" @default.
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