Background Several studies have demonstrated that circulating tumor DNA (ctDNA) can be used to predict the postoperative recurrence of several cancers. However, there are few studies on the use of ctDNA as a prognosis tool for gastric cancer (GC) patients. Objective This study aims to determine whether ctDNA could be used as a prognostic biomarker in GC patients through multigene-panel sequencing. Methods Using next-generation...