RecruitingPhase 2Drug trialOsimertinib to Suppress the Progression of GGN(EGFR Mutation-positive)This study designed to assess the efficacy of osimertinib (80 mg, orally, once daily) to suppress the progression of remaining GGN(s) in other lobes following surgical resection for actionable EGFR mutation-positive stage I lung adenocarcinoma.