KRAS and adenocarcinoma: In addition, as the majority of adenocarcinomas exhibit only a single oncogenic driver mutation and some mutations are already commonly screened for, ALK rearrangements have also been noted to be more common among those who are known to be wild type for both EGFR and KRAS, two other mutations known to be involved in NSCLC (Camidge et al, 2010; Kris et al, 2011).