Fig. 5

Chemosensitizing effect of the selected flavonoids in drug-resistant KBCH^R8–5 cell lines. Concentration dependent curves of doxorubicin with or without flavonoids (1, 5 and 10 μM) in parental KB 3–1 and KBCH^R8–5 cell lines were constructed. The IC₅₀ values of KBCH^R8–5 cell lines were equaled with parental KB 3–1 cells (Table 1). Data with error bars show the mean ± S.E.M of four experiments, each done in triplicate