De Novo SCLC Transformation From KRAS G12C- Mutated Lung Adenocarcinoma With Excellent Response to Sotorasib: A Case Report

The transformation to SCLC is a known mechanism of resistance against molecularly targeted therapies. This study reports a patient with untreated lung adenocarcinoma, characterized by a KRAS G12C mutation, which transformed into SCLC before treatment. Both the adeno-carcinoma and SCLC components were responsive to sotorasib.(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 license (http://creativecommons.org/licenses/by/4.0/).