Somatic mutations in BRAF have been found in 1-4% of all NSCLC most of which are adenocarcinomas. The G469A mutation results in an amino acid substitution at position 469 in BRAF, occurs within the highly conserved motif of the kinase domain. Most mutant BRAF proteins, such as G469A, have increased kinase activity and are transforming in vitro. In preclinical studies, lung cancer cell lines harboring the BRAF G469A mutation were not sensitive to dasatinib

DRUG: Trametinib