In addition, when stratification was analyzed by ethnicity, disease location and EBV status, ARID1A expression loss could predict poor OS for GC patients in Asians, proportion of proximal disease ≤30% and EBV (+) > 5% subgroup, but not in non-Asians, or proportion of proximal disease >30% or EBV (+) ≤ 5% subgroup. The gene discussed is ARID1A; the disease is gastric cancer.