The phase III IMPACT study (UMIN000044738) compared adjuvant gefitinib with cisplatin plus vinorelbine (cis/vin) in completely resected epidermal growth factor receptor (EGFR)-mutated non-small cell lung cancer (NSCLC)....In patients with CREBBP co-mutations, the gefitinib group had a longer DFS than the cis/vin group...