Based on our previous microarray analysis identifying NT5E as the top-ranked upregulated gene by oncogenic KRAS in NSCLC cells [86], we herein investigated the expression levels of EREG and NT5E in LUADs and those with oncogenic KRAS mutations and identified a positive correlation between the expression of these genes (Figure 1C,D). Here, EREG is linked to non-small cell lung carcinoma.