Pretreated EGFRdel19/BRAFV600E Lung Adenocarcinoma With Leptomeningeal Disease Achieving Long-Lasting Disease Control on Osimertinib, Dabrafenib, and Trametinib: A Case Report

Oncogene-addicted NSCLC inevitably becomes resistant to targeted therapy by developing acquired resistance through on-or off-target mechanisms, potentially detectable by liquid biopsy. We present the first reported case of a patient with pretreated EGFRdel19/BRAFV600E lung adenocarcinoma and symptomatic leptomeningeal metastasis obtaining durable clinical benefit on osimertinib, dabrafenib, and trametinib treatment.(c) 2023 The Authors. Published by Elsevier Inc. on behalf of the International Association for the Study of Lung Cancer. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/ 4.0/).