EGFR and adenocarcinoma: A pooled analysis identified EGFR mutation-positive patients in all clinical reports that contained advanced non-adenocarcinoma NSCLC patients harboring EGFR mutations who were treated with gefitinib27, and the PFS of those 19 EGFR mutated non-adenocarcinoma patients was 3.0 months which was less than the PFS of adenocarcinoma patients reported in previous reports7, 8, 9, 10, 11, 12.