Occurrence of the Common Acute Lymphoblastic Leukemia Antigen on Blast Cells of a Patient with Chronic Myelomonocytic Leukemia in Non - Lymphoid

Leukemias showing a conspicious lymphoid phenotype. ie. those that are HLA-DR positive. common acute lymphoblastic antigen (cALLA) positive. terminal deoxynucleotidyl transferase (TdT) negative, as well as myeloperoxidase positive (MPO). could be considered so-called mixed leukemias. Leukemias with biphenotypic blasts have to be distinguished from cases comprising two separate subpopulations that express different lineage-associated characteristics. By use of a simple new method (Immunogold Staining) we examined a case of chronic myelomonocytic leukemia in blastic phase and demonstrated simultaneous