While Kv1.3 does not display a classical N-terminal mitochondria-targeting pre-sequence, membrane-permeant mitochondriotropic channel antagonists have unequivocally demonstrated a pivotal role for mitoKv1.3 in the death of primary human lymphocytic leukemia cells as well as of B16F10 melanoma cells (Leanza et al., 2012; Leanza et al., 2017). The gene discussed is KCNA3; the disease is melanoma.