Abstract
Entrectinib, a multikinase inhibitor of ROS1 and tropomyosin receptor kinases, is recommended to treat ROS1-positive metastatic non-small cell lung cancer (NSCLC). In a previous study, entrectinib-related cardiotoxicity occurred in 2% of patients; however, lethal arrhythmias remain understudied. We encountered a case of fatal arrhythmia due to drug-induced Brugada syndrome caused by entrectinib. An 81-year-old Japanese male with lung adenocarcinoma harboring ROS1-fusion gene was treated with entrectinib. The patient developed lethal arrhythmias three days after drug initiation, including ventricular tachycardia with Brugada-like electrocardiogram changes. Echocardiography and coronary angiography revealed no evidence of acute coronary syndrome or myocarditis. Following the termination of entrectinib, the electrocardiogram abnormality improved within 12 days. Hence, paying special attention to and monitoring electrocardiogram changes is necessary. In addition, it is also necessary to consider early therapeutic interventions and discontinuation of the drug in cases of drug-induced Brugada syndrome.