STING1 and cancer: Notably, Sting1−/− Vγ4 γδ T cells exhibited significantly reduced killing capacity against Lewis lung carcinoma (LLC) (Figure S1C, Supporting Information), MC38 (Figure S1D, Supporting Information), and B16 (Figure S1E, Supporting Information) cells, suggesting that endogenous STING is required for γδ T cell‐mediated tumor inhibition in several cancer types.