Prognostic significance of the cachexia index in patients with unresectable advanced gastric cancer receiving palliative chemotherapy: a retrospective single-center study

Purpose To investigate the prognostic utility of the cachexia index (CXI) in unresectable advanced gastric cancer (UAGC). Methods The relationship between CXI and the outcomes was evaluated in 102 patients with UAGC who had received first-line palliative 5-fluorouracil-based chemotherapy between January 2012 and December 2021. Results The median survival time (MST) from first-line chemotherapy initiation was 16.2 months, and the cohort included 60 and 42 patients with high and low CXIs, respectively, based on the optimal CXI cutoff. The rates of patients with a performance status score of 0, recurrence, third-line chemotherapy, and all grade 3–4 side effects, including febrile neutropenia (FN), were significantly higher in the CXI high group than in the CXI low group. The prognosis based on MST was significantly better in the CXI high group than in the CXI low group (22.5 vs. 11.6 months, p