Nigericin is a polyether antibiotic with potent antimicrobial, antimalarial, anticoronaviral and anticancer activities. It is capable of promoting cellular potassium efflux, inducing Caspase-1/GSDMD and Caspase-3-mediated cellular pyroptosis and apoptosis in triple-negative breast cancer, and inducing apoptosis in PEL (primary exudative lymphoma) cells through mitochondrial dysfunction and Wnt/beta-catenin signaling downregulation.