This will be an observational, multicentric, retrospective/ prospective analysis of patients with advanced EGFR positive non-small cell lung cancer that receive osimertinib as 1st line therapy. The patient data will be collected at Hellenic Cooperative Oncology Group (HeCOG)-affiliated departments of oncology during scheduled patient clinical visits, from February 2020 for a total period of three years. The biological material obtained from the patients of this analysis will be possibly used in a future translational study as an exploratory analysis.
