Abstract
Leukemic blasts of two patients with acute leukemia exhibited similar characteristics. They were heterogeneous in size with a diameter of 14–30 μm in smears and unclassifiable by morphological, cytochemical, immunophenotypic and ultrastructural examinations. Cytogenetic examinations of both revealed a near-tetraploid karyotype. Blasts from both patients differentiated into macrophages in cultures with 10 ng/ml 12- O-tetradecanoylphorbol-13-acetate (TPA) which is a feature specific for myeloid blasts and the cases were thus classified as poorly differentiated acute myeloid leukemias (AML M0). Near-tetraploid poorly differentiated acute myeloid leukemias M0 seem to be a special category of AML in the morphologic, immunologic and cytogenetic (MIC) classification. The presence of very large blasts in the heterogeneous blast population in acute unclassified leukemias could be a morphological sign of near-tetraploid leukemias AML M0.
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