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Auer rod-like inclusions in multiple myeloma.
G Metzgeroth1, W Back, O Maywald
1III. Medizinische Universitätsklinik, Fakultät für Klinische Medizin Mannheim, University of Heidelberg, Wiesbadenerstr. 7-11, 68305 Mannheim, Germany. georgia.metzgeroth@med3.ma.uni-heidelberg.de
Annals of Hematology
|February 8, 2003
Summary
This study identifies Auer rod-like inclusions in IgA multiple myeloma plasma cells. These inclusions contain lysosomal enzymes, distinguishing them from Auer rods found in acute myeloblastic leukemia.
Area of Science:
- Hematology
- Oncology
- Cell Biology
Background:
- Multiple myeloma is a plasma cell malignancy.
- Auer rods are typically associated with acute myeloid leukemia.
- Intracytoplasmic inclusions in myeloma require further characterization.
Observation:
- Plasma cells in a case of IgA multiple myeloma exhibited azurophilic, Auer rod-like intracytoplasmic inclusions.
- Cytochemical staining showed strong alpha-N-esterase activity in the inclusions, with negative results for peroxidase, Sudan black, chloroacetate esterase, and PAS.
- Immunostaining confirmed IgA-kappa within plasma cells, but not in the inclusions.
Findings:
- Electron microscopy revealed Auer rod-like inclusions with lamellar substructure, similar to typical Auer rods.
- The inclusions demonstrated active lysosomal enzymes, specifically alpha-N-esterase.
- These inclusions, unlike AML Auer rods, were composed of plasma cell-associated enzymes.
Implications:
- The findings suggest these inclusions are Auer rod-related structures specific to multiple myeloma.
- This expands the understanding of morphological variations in plasma cell neoplasms.
- Characterizing these inclusions may aid in the differential diagnosis of plasma cell disorders.