The GSE75037 and GSE18842 cohorts were used to verify the 5 genes’ expression levels in cancer and normal samples with the ggplot2 package in R. The box plots showed that KRT6A and MELTF had significantly high expression levels in the LUAD samples, and CRTAC1 was expressed lowly in the LUAD samples in both GEO cohorts (Figure 7F‐G). The gene discussed is CRTAC1; the disease is cancer.