EGFR Mutations on ctDNA in Patients With Advanced NSCLC

Inclusion Criteria:

* Histologically confirmed stage IIIB/IV NSCLC;
* Patient had received ≤ 1 prior systemic chemotherapy regimens;
* Provision of blood (plasma) sample for ctDNA testing;
* Patient must be able to comply with the protocol;

Exclusion Criteria:

* Prior received ≥2 systemic chemotherapy regimens;
* As judged by the investigator, any evidence of severe or uncontrolled systemic disease (e.g. unstable or uncompensated respiratory, cardiac, hepatic or renal disease);
* Histologically confirmed small cell lung cancer or other metastatic tumors;
* Patient with no histologic or cytological diagnosis;