Digitonin, a glycoside obtained from Digitalis purpurea, could increase cell permeability by binding to cholesterol molecules and reduce tumor growth. In Vitro: Digitonin, a detergent that increases cell permeability by binding to cholesterol molecules in the cell membrane, can increase cisplatin accumulation and reduce tumour growth in vitro^[1]. In Vivo: In the liver parenchyma the concentrations are of the same magnitude. Measured with the ¹³³Xe-clearance technique, Digitonin does not alter the tumor blood flow. Digitonin enhances the tumor-growth retarding effect of CBDCA given intra-aterially at 5 mg/kg but not at 25 mg/kg^[1].