CHOICE:Decision Factor of EGFR-TKI in Chinese IV NSCLC

Inclusion Criteria: The following inclusion criteria must be met in order to be enrolled in the stage 1: Patient: * Provide informed consent * 18 years or older * Diagnosed with stage IV NSCLC * Currently receiving or previously received 1L EGFR-TKI treatment * Without communication barrier * Do not exhibit signs of cognitive impairment that would prevent participation in an interview, as informally assessed during screening by the recruiter Physician: * Provide informed consent * Specialized in departments of medical oncology, respiratory medicine, or thoracic surgery at tertiary hospitals * Manage at least 3 stage IV NSCLC patients with 1L EGFR-TKI per month * Holding the title of associate chief physician or higher The following inclusion criteria must be met in order to be enrolled in the stage 2: Patient: * Provide informed consent * 18 years or older * Diagnosed with stage IV NSCLC * Currently receiving or previously received 1L EGFR-TKI treatment * Without communication barrier * Do not exhibit signs of cognitive impairment that would prevent participation in a survey, as informally assessed during screening by the recruiter Physician: * Provide informed consent * Specialized in departments of medical oncology, respiratory medicine, or thoracic surgery at tertiary hospitals * Manage at least 3 stage IV NSCLC patients with 1L EGFR-TKI per month * Holding the title of attending physician or higher Exclusion Criteria: Not applicable.