ENTPD1 and acute myeloid leukemia: AML cells are characterized by altered expression of nucleotide receptors [20,21,22] and CD39 (ecto-nucleoside triphosphate diphosphohydrolase 1 [E-NTPDase1]) and CD73 (ecto-5′-nucleotidase) ectonucleotidases [23], compared to normal cells.