Fig. 1

Growth inhibition of gefitinib and ATRA on lung cancer cells. a. Cell viability (%) of A549 and A549GSC cells treated with gefitinib alone or combined with 10 μmol/L ATRA for 72 h; B. Cell viability (%) of H1650 and H1650GSC cells treated with gefitinib alone or combined with 10 μmol/L ATRA as described in Methods. c and d. Cell viability (%) of A549 and H1650 cells treated with ATRA alone, respectively. All experiments were performed in triplicate, and data are expressed as means±s.d. (n = 3). Error bars represent s.d. of replicate data points. *P < 0.05, compared to the control