Heterogeneity of anthracycline retention and response to efflux blockers in human tumors.


Rapid cellular efflux of certain natural products used in cancer chemotherapy leads to reduced cytotoxicity and resistance. Multiple Drug Resistance (MDR) gene related glycoproteins are believed to act as the drug efflux pump. Several non-cancer therapy drugs (e.g., verapamil, phenothiazines) compete for the p-glycoprotein pump and thus can block efflux of… (More)


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