Compared with HIs, the PD-1 proportion in the Foxp3+ γδ T cell population was significantly increased (median: 1.2% vs. 0.1%, P < 0.001), and the Foxp3+ Vδ2 subset was also increased in AML patients (median: 0.7% vs. 0.1%, P = 0.004) (Figures 3A, B). This evidence concerns the gene FOXP3 and acute myeloid leukemia.