The ADAURA trial was a randomized, double-blind, placebo-controlled, phase 3 study that evaluated the survival benefits of adjuvant osimertinib, an epidermal growth factor receptor (EGFR)-tyrosine kinase inhibitor (TKI), in the treatment of patients with completely resected EGFR-mutated stage IB-IIIA non-small cell lung cancer (NSCLC).1 A total of 682 adult patients with completely resected stage IB, II, IIIA NSCLC were recruited and randomized 1:1 to receive either osimertinib 80mg daily or placebo for 3 years until disease recurrence or treatment completion.1 The primary endpoint of the ADAURA trial was disease-free survival (DFS) in stage II-IIIA patients.1 Overall survival (OS) is one of the key secondary endpoints of the ADAURA trial.1