CD47 and lung cancer: Repurposing cardiac glycosides (CGs) significantly strengthens the efficacy of anti‐CD47 antibody for lung cancer treatment by boosting macrophage phagocytosis. This novel combination blocks the “don't eat me” signal and increases dual “eat‐me” signals, Fc‐FcγR and cell surface expression of calreticulin (ecto‐CRT).