CD33 and acute lymphoblastic leukemia: In addition, CD33 is also found on abnormal cells of other myeloid neoplasms (e.g., myelodysplastic syndromes and myeloproliferative neoplasms) [12], and on subsets of B-cell and T-cell acute lymphoblastic leukemia (ALL)/lymphoblastic lymphomas [13,14] perhaps consistent with its occasional expression on normal non-myeloid cells.