Fig. 2
Isobolographic analysis of the cytotoxic effect of the combination treatment on the two cell lines. a The synergistic effect of the combination treatment on cisplatin-resistant A549 cells. b The synergistic effect of the combination treatment on cisplatin-sensitive A549 cells. The solid and hollow dots represent the IC50 values of the combination treatments at 0.25 and 0.5 µg/ml TET, respectively