NCR3 and acute monocytic leukemia: We then evaluated NK92 cell cytotoxicity against K562 chronic myeloid leukemia cells and THP-1 acute monocytic leukemia cells, given their expression of B7-H6, a ligand for NKp30 (41, 42), and NKp30 as a prognostic biomarker in AML (26, 43, 44).