KLRK1 and acute myeloid leukemia: Moreover, univariate Cox regression analysis indicated that the frequencies of NKG2D+ γδ T cells, NKG2D+ Vδ2 T cells, NKG2D+TIGIT− Vδ1 T cells, NKG2D−Foxp3+ Vδ2 T cells, and NKG2D+Foxp3− Vδ2 T cells had significant differences in survival rates and were independent prognostic risk factors for AML prognosis (Table 3).