To evaluate the efficacy and safety by treating the advanced non small cell lung cancer (NSCLC) patients who have failure of standard dose EGFR-TKIs(Erlotinib or Gefitinib ) with high-dose, pulsatile Erlotinib(450mg every 3 days) or Gefitinib (1000mg every 4 days)
the purpose of this study is to evaluate the efficacy and safety of high-dose，pulsatile Erlotinib/Gefitinib in advanced non small cell lung cancer (NSCLC) patients after failure of standard dose EGFR-TKIs（Epidermal Growth Factor Receptor-Tyrosine Kinase Inhibitors）