TIGIT and acute myeloid leukemia: Interestingly, the frequency of TIGIT+Foxp3+ γδ T cells was positively correlated with Foxp3+ γδ T cells in de novo AML patients and HIs (P ≤ 0.001, r = 0.838, and P = 0.009, r = 0.553, respectively) (Figure 2(c)).