In NSCLC, as opposed to EGFR mutations, KRAS mutations are more common in Western than in Asian or Australian populations (23–33% vs. 2–15%, respectively, of cases) and in long-term tobacco smokers than in never-smokers (20–44% vs. 6–10%, respectively) [25,78,79,80,81]. This evidence concerns the gene KRAS and non-small cell lung carcinoma.