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New non-cytotoxic taxanes synthesized from 10-deacetylbaccatin III and
special hydrophobic acylating agents show remarkable MDR reversal act
ivity (less than or equal to 99.8%) against drug-resistant human breas
t cancer cells when co-administered with paclitaxel or doxorubicin. Th
is activity is ascribed to the highly efficient blocking of P-glycopro
tein efflux by these new taxanes. (C) 1998 Elsevier Science Ltd. All r
ights reserved.