FOXP3 and acute myeloid leukemia: Notably, we found a prominent positive correlation between PD-1+Foxp3+ γδ T cells and the Foxp3+ γδ T cell proportion (R = 0.627, P = 0.003) in AML patients, and there was no significant correlation between the proportions of those two groups (R = 0.430, P = 0.110) in HIs.