Abstract
Osimertinib is the most efficient first-line drug, with least adverse effects, for metastatic non-small-cell lung carcinoma (NSCLC) harboring epidermal growth factor receptor (EGFR) mutations with exon 19 deletion or exon 21 L858R mutations. Herein, we present a 68-year-old woman who had chronic hepatitis B with aggressive NSCLC and received osimertinib as cancer treatment for 4.5 months. This is the first report of mortality due to osimertinib-related acute fulminant hepatitis. Clinicians should routinely arrange for hepatitis B virus (HBV) screening and prescribe antiviral drugs to patients with chronic HBV infection before osimertinib administration.