Analysis of adverse drug reactions of Osimertinib in the 2nd‐line treatment of EGFR mutant advanced nonsmall cell lung cancer

The aim was to analyze the clinical characteristics of adverse drug reactions (ADRs) induced by Osimertinib and their effects on the prognosis, so as to further provide reference for clinical medication. This was a retrospective study, and 66 nonsmall cell lung cancer (NSCLC) patients who had ADR in the 2nd‐line treatment with Osimertinib from January 2017 to December 2018 were included. Clinical characteristics and survival in subgroups of Osimertinib‐related ADRs were analyzed. The majority of patients who developed ADRs after the 2nd‐line treatment of Osimertinib were mainly middle‐aged and elderly women. Osimertinib‐related ADRs were mainly found in the skin, respiratory and digestive systems. The most common ADRs were rash (69.70%), diarrhea (66.67%), stomatitis (54.55%), and fatigue (51.52%). The degree of Osimertinib‐related ADRs was tolerable. Only seven patients experienced grade 3 ADRs, all of which involved the skin system. Exactly 92.42% of patients had more than two adverse reactions. The median PFS was influenced by the type, quantity, and severity of Osimertinib‐related ADRs. Osimertinib‐related ADRs are closely related to the prognosis of patients so that more attention should be paid to monitoring the occurrence of ADRs in clinical use of Osimertinib, especially ADRs in the skin, respiratory system and digestive system.