CD38 and acute lymphoblastic leukemia: It has been demonstrated that brain, colon, prostate and lung CSCs bear the antigen CD133, while ovarian CSCs are CD24+ and CD133+, acute myeloid leukemia stem cells are CD34+ and CD38−, head and neck CSCs are CD44+, B-precursor acute Lymphocytic leukemia CSCs are CD34+, CD38+ and CD19+ [8].