Evaluate Erlotinib Efficacy and Safety as the 2nd/3rd Treatment in NSCLC With EGFR M(-) and C-met(-)

In this phase II, open, single arm study, it will be evaluated of the efficacy and safety of erlotinib in 2nd/3rd line of EGFR WT and c-Met negative advanced NSCLC.The treatment goes as follows:Erlotinib 150mg/day taken orally until disease progression or intolerable toxicities.The primary end point of the study was 6 months PFS rate.