According to the types of samples and the purpose of the study, the research consists of two groups: plasma and tissue matching group and predicting clinical efficacy group. The samples of the plasma and tissue matching group are the same period plasma and matched FFPE(formalin-fixed paraffin-embedded tissue)samples which will be collected before the first time patients accept any anti-tumor treatment. The samples of predicting clinical efficacy group are FFPE samples which will be collected before the patients receive EGFR-TKI treatment. In addition, the subjects have the complete prognostic follow-up data.
