KRAS and lung adenocarcinoma: Analyzing miRNA expression profiling of lung cancer, Dacic et al. observed a correlation of miRNAs with mutational status of EGFR in lung adenocarcinomas, in which miR-155 was upregulated only in EGFR/KRAS-negative samples, and miR-25 was upregulated only in EGFR-positive group and miR-495 was upregulated only in KRAS-positive adenocarcinomas.