A Study to Learn About the Tests Looking for a Gene Mutation in Adults With Lung Cancer in China (ELEGANT)

The main aim of this study is to examine the percentage of people with lung cancer who carry a certain gene mutation (epidermal growth factor receptor exon 20 insertions - EGFR ex20ins) and their frequency in Chinese participants with Non-small cell lung cancer (NSCLC) after having been tested for the gene mutation.Data from the participant's electronic medical records at the hospital will be collected.

Inclusion Criteria:Cohort 1 and 2:1. Participants with a diagnosis of locally advanced or metastatic NSCLC, clinical staging of IIIB-IV.Cohort-1:1. Participants who have received NGS testing and have EGFR ex20ins positive result.Cohort-2:1. Participants who have received NGS testingExclusion Criteria:1. Incomplete information, including key demographic characteristics, clinicopathological characteristics, and genetic testing information.