KCNH2 and cancer: CsEKerg1 toxin, from the Centruroides sculpturatus scorpion has been evaluated as a hERG current inhibitor in an in vitro cancer model, suggesting its potential use in Kv11.1 channel-overexpressing cancer cells (Nastainczyk et al., 2002); this result opens a window of opportunity for other Kv11.1-blocking toxins described until now (Jimenez-Vargas et al., 2012).