KCNA5 and cancer: Kv1.5 is a rapidly activating, voltage-gated K+ channel encoded by KCNA5 that inactivates slowly and incompletely.1 Distribution of Kv1.5 is widespread: it is expressed in various cell types in the central nervous system2, 3 and is implicated in certain types of cancers.4 Kv1.5 is, however, perhaps best studied in the cardiovascular system.