Value of combined morphologic, cytochemical, and immunophenotypic features in predicting recurrent cytogenetic...

To evaluate the reliability of previously described morphologic, cytochemical and immunophenotypic criteria for the identification of acute myeloid leukemias (AMLs) with t(8;21), inv(16)/t(16;16) and t(15;17), 300 cases were reviewed retrospectively. Eighteen AMLs with features of t(8;21), 31 with features of inv(16)/t(16;16), and 22 with features of t(15;17) were identified. Cytogenetic studies were available for 228 cases and identified 15 cases of t(8;21), 30 cases of inv(16)/t(16;16), 18 cases of t(15;17) and 11 cases 11q23 AML. The true positive rate for pre-cytogenetic evaluation was 95% for t(15;17), 88% for inv(16)/t(16;16) and 87.5% for t(8;21). No difference in 5-year survival was identified in the precytogenetic and corresponding cytogenetic disease groups. No specific features to predict 11q23 abnormalities were identified. This study confirms the reliability of a combined morphologic, cytochemical and immunophenotypic approach to the initial classification of AML. Cytogenetic studies are still needed on all cases to identify the small proportion of cases that will be missed by these methods and to identify other significant cytogenetic abnormalities in AML.