AIM:To explore the mechanism of reversal action of Changweiqing oral liquid(Radix Astragali,Radix Codonopsis,Rhizoma Atracty lodis macroce phalae,etc.

• 目的:探讨肠胃清(黄芪、党参、白术等)逆转肿瘤多药耐药的作用机制。