RecruitingPhase 2Drug trialOsimertinib Induction and Maintenance for Chemo-ineligible Stage III Unresectable EGFR+ NSCLC: Single-arm StudyThe purpose of this study is to measure efficacy and safety of osimertinib as induction therapy prior to curative intent RT and maintenance osimertinib in chemotherapy ineligible or refusal adult patients with Stage III, unresectable NSCLC with common EGFR mutations (exon 19 deletion or L858R).