Several patient/tumor characteristics identified at the time of diagnosis of metastatic EGFRm NSCLC were considered to be potential prognostic factors for survival in univariate analysis: ECOG PS at index date (≤2 vs. >2), presence of brain metastases (yes vs. no), and EGFR mutation (exon 19 (E19del) vs. exon 21 (L858R). The gene discussed is EGFR; the disease is non-small cell lung carcinoma.