EGFR Mutation Detection From Advanced NSCLC Patient Tissue and Plasma in EGFR-TKI Treatment

This study has been designed in order to detect EGFR mutation abundance of tissue and concentration of plasma from Advanced Non-small Cell Lung Cancer during treatment with Tyrosine Kinase Inhibitor (TKI) .Through this experiment the investigators aim to evaluate the feasibility of plasma EGFR detection and evaluate the correlation of EGFR mutations and prognosis.