EZH2, a histone-lysine N-methyltransferase enzyme, has been documented to be associated with the occurrence and development of malignant tumors [12–14], and also be involved in the cellular biological functions of various cancers, including gastric cancer, hepatocellular carcinoma, bladder cancer, and nasopharyngeal cancer [15–18]. The gene discussed is EZH2; the disease is gastric cancer.