{Reference Type}: Letter {Title}: Letter to the editor: 5-year follow-up results of a JCOG1104 (OPAS-1) phase III non-inferiority trial to compare 4 courses and 8 courses of S-1 adjuvant chemotherapy for pathological stage II gastric cancer. {Author}: Kim HD;Ryu MH;Lee JS;Kang YK; {Journal}: Gastric Cancer {Volume}: 27 {Issue}: 4 {Year}: 2024 Jul 11 {Factor}: 7.701 {DOI}: 10.1007/s10120-024-01496-4