Figure 3: Resistance to cisplatin by A549Luc and parental A549 cells. Viability of A549 cells was assessed by MTT assay after treatment with cisplatin for 24 h (A), 48 h (B) and 72 h (C). Viability of A549Luc was assessed by MTT assay after treatment with cisplatin for 24 h (D), 48 h (E) and 72 h (F). Data are shown as mean ± SEM.