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P-glycoprotein optical density values and MDR1 mRNA expression in tumor tissues after different chemotherapeutic treatment. A: P-glycoprotein (P-GP) optical density values; B: MDR1 mRNA expression. aP < 0.05 vs adriamycin (ADM) group; cP < 0.05 vs ADM + rifampicin (RFP) group. NS: Normal saline; APS: Astragalus polysaccharides; VER: Verapamil.
