Advanced EGFR-mutant NCSLC resistant to osimertinib therapy as a result of a novel CGN-RET fusion mutation with favorable response to combined osimertinib and selpercaptinib, case report

Abstract

RET-fusions are a known cause of acquired osimertinib resistance in patients with advanced NSCLC. Herein we describe the case of a patient who developed resistance to osimertinib, via acquisition of a novel CGN-RET fusion mutation. She had a favorable response to treatment with RET-targeting TKI selpercatinib, in combination with osimertinib.