Real World Study to Evaluate the Efficacy and Resistant Mechanism of Erlotinib/Gefitinib Combined With Bevacizumab in First Line EGFR Mutation Positive Advanced Non-aquamous Non-small Cell Lung Cancer

A retrospective study of 30 cases of advanced non-squamous non-small cell lung cancer (NSCLC) with EGFR mutation positive treated with A+T was conducted to observe the efficacy and safety of A+T regimen in the real world. Exploratory research contents are as follows: 1. Consistency between tissue gene test (NGS) and plasma gene test (NGS) at the initial diagnosis; 2. Consistency between tissue gene test (NGS) and plasma gene test (NGS) at the progression of A + T treatment; 3. New drug resistance mechanism of A + T treatment; 4. Plasma dynamics during A + T treatment. Detection (the first efficacy evaluation and a blood sampling before imaging PD) exploration and imaging progress sequence; 5. Plasma large panel dynamic drive gene mutation spectrum analysis to build disease progression risk model.