CD8A and neoplasm: A novel zinc–organometallic framework vaccine, which releases Zn2+ in the dendritic cell (DC) lysosome and tumor microenvironment, amplifies the cyclic guanosine monophosphate‐adenosine monophosphate synthase‐stimulator of interferon genes signal, promotes DC maturation and antigen cross‐presentation, induces strong CD8+ T cell‐specific proliferation and activation.