CD33 and acute lymphoblastic leukemia: The frequency of aberrant expression in ALL was 10% (7/71) which was lower than the results of Paietta et al.17 i.e. 21.2%and 39% claimed by Bhushan et al.18, Hussain et al., 2011 also studied the expression of T-ALL specific markers in B-ALL and 15% cases (4/26) of T-cell ALL showed CD13, CD33 and HLA-DR expression in their study.19