FCGR1A and acute myeloid leukemia: NKCE molecule was consistently active on all CD64-positive AML cell lines (that is NB-4, OCI-AML2, MV4-11, OCI-AML3, THP-1 and SKM-1) whatever the CD64 density of expression, with maximum killing activity globally comparable to those observed for CD64-negative or low cell lines.