RESUMEN
Immunophenotyping has become common in the diagnosis and classification of leukemia. To evaluate the immunophenotype of acute myeloid leukemia (AML), multiparameter flow cytometry and CD45/SSC gating were used to analyze the surface and cytoplasmic antigen expressions in 115 cases of AML. The results were compared with the French-American-British (FAB) Cooperative Group classification to help define the best use and role of multiparameter flow cytometry in the diagnosis and proper classification of AML. The results showed that CD38, CD38 and CD13 were the most commonly expressed antigen (94.8%, 91.3% and 89.6%, respectively). CD7 was the most commonly expressed lymphoid antigen (20.2%), followed by CD19 (16.5%) and CD2 (15%). Some immunophenotypes correlated with FAB type, including increased frequency of CD2 in M(3); lack of HLA-DR, CD34 and CD56 expression in M(3); increased frequency of CD19 in M(2), CD14 and CD56 in M(5) and lack of MPO in M(0). In conclusion, multiparameter flow cytometry is a reliable technique in the diagnosis of AML, and some immunophenotypes correlate with FAB type.