KCNK2 and hepatocellular carcinoma: In their study of KNCK potassium ion channel subfamily expression in hepatocellular carcinoma, Li et al. [28] found that while KCNK2, KCNK15, and KCNK17 were downregulated, KCNK9 was upregulated, and this pattern of expression correlated with better prognosis in patients.