STING1 and cancer: We conducted DC of cancer cells with WT or STING−/− E‐MSCs and found that STING−/− E‐MSCs failed to induce IFNβ accumulation in the DC (Figure 6D), concomitant with defects in increasing HLA‐I expression on the surface of cancer cells (Figure 6E) and increasing NK resistance (Figure 6F).