four patients refractory to doxorubicin ( dx ) and 9 patients refractory to 4'epidoxorubicin ( 4'epidx ) were treated with verapamil ( vrp ) ( 120 mg every 6 h for 3 days ) plus 4'epidx ( 80 mg/m2 i.v . bolus , together with the 6th vrp administration ) .
C0013089
doxorubicin
C0014582
epidoxorubicin