| EOGC | Early-onset gastric cancer |
| AC | Adjuvant chemotherapy |
| AOGC | Average-onset gastric cancer |
| OS | Overall survival |
| PNI | perineural invasion |
| GC | Gastric cancer |
| Hp | Helicobacter pylori |
| SEER | Surveillance, Epidemiology, and End Results |
| ACRG | Asian Cancer Research Group |
| SMC | Samsung Medical Center |
| LVI | Lymphovascular invasion |
| CEA | Carcinoembryonic antigen |
| CA 19-9 | Carbohydrate antigen 19-9 |
| PSM | Propensity score matching |
| PH | proportional hazard |
| SMD | Standardized mean differences |
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