Long-Term Survival Outcomes of Elderly Patients Treated With S-1 or Capecitabine Plus Oxaliplatin for Stage II or III Gastric Cancer: A Multicenter Cohort Study

Abstract

PURPOSE: Tegafur/gimeracil/oteracil (S-1) and capecitabine plus oxaliplatin (CAPOX) are standard adjuvant chemotherapies (ACs) administered after gastrectomy to patients with stage II or III gastric cancer. However, the efficacy of AC in elderly patients remains unclear. The objective of this retrospective multicenter cohort study was to compare the efficacies of S-1 and CAPOX AC in patients aged >/=70 years. MATERIALS AND METHODS: Nine hundred eighty-three patients who were treated with AC using S-1 (768 patients) or CAPOX (215 patients) were enrolled in this study. Each patient underwent AC after curative gastrectomy for stage II or III gastric cancer at one of 27 hospitals in the Republic of Korea between January 2012 and December 2013. Relapse-free survival (RFS) and overall survival (OS) were analyzed according to AC regimen and age group. RESULTS: Of the 983 patients, 254 (25.8%) were elderly. This group had a similar RFS (P=0.099) but significantly poorer OS (p=0.003) compared with the non-elderly group. Subgroup analysis of the non-elderly group revealed no AC-associated differences in survival. Subgroup analysis of the elderly group revealed significantly better survival in the S-1 group than in the CAPOX group (RFS, P<0.001; OS, P<0.001). Multivariate analysis revealed that the CAPOX regimen was an independent poor prognostic factor for RFS (hazard ratio [HR], 1.891; 95% confidence interval [CI], 1.072-3.333; P=0.028) and OS (HR, 2.970; 95% CI, 1.550-5.692; P=0.001). CONCLUSIONS: This multicenter observational cohort study found significant differences in RFS and OS between S-1 and CAPOX AC among patients with gastric cancer aged >/=70 years.

Tegafur/gimeracil/oteracil (S-1) and capecitabine plus oxaliplatin (CAPOX) are standard adjuvant chemotherapies (ACs) administered after gastrectomy to patients with stage II or III gastric cancer. However, the efficacy of AC in elderly remains unclear. The objective this retrospective multicenter cohort study was compare efficacies S-1 CAPOX aged ≥70 years.Nine hundred eighty-three who were treated using (768 patients) (215 enrolled study. Each patient underwent curative for cancer at one 27 hospitals Republic Korea between January 2012 December 2013. Relapse-free survival (RFS) overall (OS) analyzed according regimen age group.Of 983 patients, 254 (25.8%) elderly. This group had a similar RFS (P=0.099) but significantly poorer OS (p=0.003) compared non-elderly group. Subgroup analysis revealed no AC-associated differences survival. better than (RFS, P<0.001; OS, P<0.001). Multivariate that an independent poor prognostic factor (hazard ratio [HR], 1.891; 95% confidence interval [CI], 1.072-3.333; P=0.028) (HR, 2.970; CI, 1.550-5.692; P=0.001).This observational found significant