This study (NCT01260181) was a phase II, non-randomized, open-label study to evaluate the anti-tumoral activity of erlotinib in patients with locally advanced or metastatic NSCLC with EGFR activating mutations….Median disease duration was 1 month (0–32 months) and histology for 96.7% of patients was adenocarcinoma....For exon 19 patients, the median PFS was 14.4 months (95% CI: 4.2–41.8) and for exon 21 9.8 months (95% CI: 3.8–13.5).