Reversal of P-gp-mediated multidrug resistance by Bromotetrandrine in vivo is associated with enhanced accumulation of chemotherapeutical drug in tumor tissue.

Br-Tet caused a significant reversal of P-gp-mediated MDR, not only in vitro but also in vivo. The MDR reversal activity of Br-Tet in vivo was associated with the enhancement of accumulation of chemotherapeutical drugs in tumor tissue.