When only samples containing leukemic cells demonstrated by chromosomal or fluorescence in situ hybridization (FISH) analysis after induction were evaluated, positive correlations were found between CD33+ cell percentages determined by FCM/CD45 and myeloblast percentages determined by morphology (r=0.672, p<0.001).     ///    The identification of CD33+ cells by FCM/CD45 is useful for the evaluation of bone marrow myeloblasts in AML..     ///    "The CD33+ cell percentages evaluated by FCM/CD45 were strongly correlated to the myeloblast percentages determined by microscopic examination (r=0.8360, p<0.001). "    ///    "Using flow cytometry with a CD45-blast gate (FCM/CD45), 226 bone marrow aspiration samples serially collected from 71 patients with de novo AML were analyzed. "