48 patients with EGFR-positive NSCLC were identified and divided into subgroups by mutation. Progression-free survival (PFS), overall survival (OS) and time to treatment failure (TTF) in those who were treated with Afatinib (Giotrif®) were evaluated….Patients with mutations in exon 18 and 21 and patients with mutations in exon 20 had the worst outcome with an OS of 6.5 months (95% CI: 4-30) a PFS of 2.5 months (95% CI: 1-4) and an OS of 3 months (95% CI: 2-4) and a PFS of 4.5 (95% CI: 4-5), respectively. Patients with these mutations also had significantly lower TTF.