TIGIT and acute myeloid leukemia: In addition to the classic MHC‐I specific inhibitory receptors, other non‐MHC specific inhibitory receptors, like T cell immunoglobulin and ITIM domain (TIGIT), killer cell lectin‐like receptor (KLRG1), and programmed cell death protein 1 (PD‐1) are also over‐expressed on NK cells from AML patients.25, 26, 27