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Salinomycin, a polyether antibiotic acting as a highly selective potassium ionophore and widely used as an anticoccidial drug, was recently shown to act as a specific inhibitor of cancer stem cells. In the present study we report that salinomycin acts as a potent inhibitor of multidrug resistance gp170, as evidenced through drug efflux assays in MDR cancer cell lines overexpressing P-gp (CEM-VBL 10...