The EGFR ex20ins data from the other cohorts were collected from other research (7 (link),9 (link)-12 (link),19 (link)-21 (link)). SPSS 22.0 statistics software (SPSS, Inc., Chicago, IL, USA) was used for the statistical analysis. The Chi-square (χ2) test was used to compare the rates among groups with different features. Hierarchical clustering analyses were performed based on Euclidean distance and the average-linkage method. The statistical tests were 2-sided, and the significance level was set as P<0.05.