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The Blast Crisis of Chronic Granulocytic Leukaemia: Megakaryoblastic Nature of Cells as Revealed by the Presence of Platelet‐Peroxidase—A Cytochemical Ultrastructural Study
Author(s) -
BretonGorius J.,
Reyes F.,
Vernant J. P.,
Tulliez M.,
Dreyfus B.
Publication year - 1978
Publication title -
british journal of haematology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.907
H-Index - 186
eISSN - 1365-2141
pISSN - 0007-1048
DOI - 10.1111/j.1365-2141.1978.tb01101.x
Subject(s) - precursor cell , peroxidase , endoplasmic reticulum , cytochemistry , myeloperoxidase , blast crisis , ultrastructure , reticulum , biology , microbiology and biotechnology , pathology , chemistry , immunology , leukemia , cell , enzyme , medicine , biochemistry , inflammation
The origin of cells in the blast crisis of some cases of chronic granulocytic leukaemia (CGL) remains controversial. Difficulties arise from the lack of cytochemical characteristics of differentiation. This report concerns the nature of cells in the blast crisis of a case of CGL in which blast cells exhibited an undifferentiated or lymphoid appearance by light and electron microscopy. The majority (90%) of such cells contained a peroxidase in the endoplasmic reticulum distinct from myeloperoxidase. In addition, some micromegakaryocytes could be recognized among the peroxidase reactive cells, by the presence of typical granules and demarcation membranes. Since this peroxidase exhibited identical characteristics to that of normal megakaryocytic precursors, these blast cells could be identified as megakaryoblasts. These data emphasize the possible megakaryoblastic nature of cells occurring in other cases of CGL blast crisis.