This result is in line with those reported by previous studies showing a higher expression of CD8 in ARID1A-mutant tumor tissues in patients with OCCC [34], and enrichment of CD8+ T cells, CD4+ T cells, and NK cells in ARID1A-mutant tumor tissues in patients with gastric cancer [39], although the underlying mechanisms are unknown. Here, ARID1A is linked to gastric cancer.