An increasing body of evidence now supports the essential role of potassium channels in the initiation and progression of tumors, particularly in colorectal cancer (den Uil et al., 2016; Rapetti-Mauss et al., 2017), hepatocellular carcinoma (Fan et al., 2018), and gastric cancer (Liu et al., 2015). Here, KCNA3 is linked to gastric cancer.