CD38 and acute lymphoblastic leukemia: This observation has been extended by Büring et al., who analyzed leukemic blasts from patients with ALL, AML or CML, showing that CDCP1 is expressed in CD34+/CD38− and CD34+/CD133+ cells, but not in mature erythroid progenitors; moreover, it is expressed at similar levels as CD133, especially in AML blasts [22].