For this purpose, we collected results from all samples with EGFR c.2369C>T p.(Thr790Met) variants from yearly EQA programs for EGFR analysis in NSCLC between 2013 and 2018, organized by the European Society of Pathology (ESP) and the French national Gen&Tiss consortium [28, 29]. Here, EGFR is linked to non-small cell lung carcinoma.