Case Report A comprehensive clinical trajectory of EGFR A763_Y764insFQEA-positive non-small cell lung cancer treated with fifth-line osimertinib following circulating tumor DNA-based detection: a case report Tomohiro Oba, Kenji Kusano, Hidekazu Matsushima Published online: 17 December 2025 PDF Reporting Checklist Peer Review File COI Form Open Access
