Objective To explore the effect of epidermal growth factor receptor-tyrosine kinase inhibitors(EGFR-TKIs) and chemotherapeutic drug alone, concurrent and sequential administration on apoptosis of non-small cell lung cancer(NSCLC) cells with acquired TKI-resistance. Methods NSCLC cell lines with TKI-resistance gene mutations(T790 M and c MET) such as PC9 ER, H1975 and HCC827 GR as well as TKI-sensitive gene mutation(exon 19) cell lines PC9 and HCC827 were selected. Cell viability was detected by MTS assay wh...