It has been shown that the delayed rectifier potassium channel subunits, voltage-gated potassium channed (Kv), Kv1.3, Kv1.5, Kv1.6, Kv2.1 and Kv2.2, are expressed in human gastric cancer cells, and that the downregulation of this expression significantly inhibits the proliferation of gastric cancer (8). The gene discussed is KCNA5; the disease is gastric cancer.