CD226 and B-cell chronic lymphocytic leukemia: Despite their importance to initiate anti-tumor responses, reports on the expression levels of these receptors on NK cells in CLL, like NKp30, NKp46, DNAX accessory molecule-1 (DNAM-1), killer-cell immunoglobulin-like receptors (KIR), and CD16, are inconsistent [39,42,43,44,45].