Specifically, compared with DMSO treatment, UA treatment increased the expression of IFN‐γ, TNF‐α, IL‐2, CD107a, and granzyme B in OT‐I CD8+ CTLs (Figure 1E,F; Figure S1E, Supporting Information) and enhanced the cytotoxic activity against antigen‐pulsed EL4 tumor cells in vitro (Figure 1G). Here, TNF is linked to neoplasm.