A significant positive correlation between miR-30c and KRAS or ELK1 was observed in the 21 lung tumor samples (P = 0.0229 and P = 0.0011, respectively) (Fig. 6b,c) and between miR-21 and ELK1 in 160 adenocarcinoma samples from the TCGA (LUAD data set) (Fig. 6d). This evidence concerns the gene KRAS and adenocarcinoma.