AT-rich interactive domain 1A (ARID1A), located on human chromosome 1p35.3, is a frequently mutated gene locus in many tumors, including OCCC, endometrial cancer, ovarian endometrioid cancer, gastric cancer, colorectal cancer and pancreatic cancer (Guan et al., 2011a; Wang et al., 2011; McConechy et al., 2012; Kadoch et al., 2013). The gene discussed is ARID1A; the disease is gastric cancer.