Mechanisms of multidrug resistance in human tumor cells. The roles of P-glycoprotein, DNA topoisomerase II, and other factors.

Abstract excerpt

Multidrug resistance (MDR) associated with overexpression of P-glycoprotein (Pgp) is a well-described experimental phenomenon that appears to have clinical correlates. However, recent descriptions of non-P-glycoprotein forms of MDR have complicated efforts to detect and circumvent MDR in the tumors of patients. One major form of natural product MDR appears to be due to alterations in the amount of activity of DNA...

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