Background: The neurotrophic tyrosine receptor kinase (NTRK) fusion is an oncogenic driver found in various solid tumors.Larotrectinib is a highly selective TRK inhibitor and was approved for the treatment of advanced NTRK fusion-positive solid tumors by MFDS in 2020.However, the pivotal clinical trial includes only selected and fit patients with small proportion (less than 5%) of Asian ethnicity.