BACKGROUND: Geographic variability in epidermal growth factor receptor ( METHODS: This was an observational, multicenter, cross-sectional study. Sensitizing RESULTS: A total of 172 patients with surgically resected non-squamous NSCLC were analysed. Median age was 67.5 years and 57.6% were male, 96.5% had adenocarcinoma histology and 65% had stage IA/IB. CONCLUSIONS: The prevalence of