Ras-related C3 botulinum toxin substrate 1 (RAC1), Ras homolog family member A (RHOA) and cell division control protein 42 homolog (CDC42), which are the most important and extensively studied members of Rho GTPases, have been identified to regulate actin cytoskeleton reorganization, migration, and metastasis and promote the development of lung cancer [8–11]. This evidence concerns the gene RAC1 and lung cancer.