Resistance of cancer cells to chemotherapy continues to be a major clinical obstacle to the successful treatment of cancer. It is critical to reverse multidrug-resistance for improving chemotherapy effect. The mechanism of multidrug resistance is mainly relevant with the drug resistant gene mdr-1 and expression of its coding glycoprotein P-gp.The apoptosis suppressor gene bcl-2 and its coding protein Bcl -2 are also concerned with multidrug-resistance. RNA interference (RNAi) is a phenomenon in cell that do...