KRAS and lung cancer: Subsequently, we analyzed the expression of miR-30c and miR-21 in vivo in a mouse model of lung cancer (KrasLSL-G12D) that involves activation of an oncogenic Kras allele (KrasG12D) following intranasal administration of plaque-forming units of a recombinant adenovirus-expressing Cre recombinase (AdenoCre)31.