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Phenotypic characterization of cellular components of cardiac myxoma: a light microscopy and immunohistochemistry
A Deshpande1, P Venugopal, A S Kumar
1Department of Pathology and Cardiothoracic Surgery, All India Institute of Medical Sciences, New Delhi.
Insights
Cardiac myxoma, the most common heart tumor, originates from multipotent cells. These cells can differentiate into various mesenchymal or epithelial cell types, showing mixed markers.
Area of Science:
- Cardiovascular Pathology
- Tumor Biology
- Cellular Differentiation
Background:
- Cardiac myxoma is the most frequent primary cardiac tumor.
- Understanding the cellular origin and differentiation potential of cardiac myxomas is crucial for diagnosis and research.
Purpose of the Study:
- To investigate the cellular composition and differentiation characteristics of cardiac myxomas.
- To evaluate the expression of various cellular markers in cardiac myxoma cells.
Main Methods:
- Light microscopy and immunohistochemistry were employed on 41 and 30 cardiac myxoma cases, respectively.
- Analysis included reactivity for endothelial markers (Factor VIII-related antigen, Ulex europaeus agglutinin-1), muscle markers (desmin, myoglobin), epithelial markers (cytokeratin), and mesenchymal markers (vimentin, S-100).
Main Results:
- Endothelial markers (FVIIIR-Ag, UEA-1) were positive in 23 cases, with UEA-1 being more sensitive.
- Muscle markers (desmin, myoglobin) showed positivity in 16 and 24 cases.
- Epithelial (cytokeratin) and mesenchymal (vimentin, S-100) markers were also detected, with one case exhibiting glandular differentiation.
Conclusions:
- Cardiac myxomas likely arise from multipotent cells with the capacity for diverse differentiation.
- These cells can differentiate along mesenchymal or epithelial pathways, potentially exhibiting markers of both lineages concurrently.
Abstract:
Cardiac myxoma is the most common primary tumor of the heart. A detailed evaluation of cell types in 41 cardiac myxomas by light microscopy and in 30 cases by immunohistochemistry was made. Reactivity to the various antisera were observed in the surface lining cells, the stromal myxoma cells and the cells in the perivascular location. Factor VIII-related antigen (FVIIIR-Ag) and Ulex europaeus agglutinin (UEA-1), both endothelial markers, were positive in 23 cases each. UEA-1 was found to be a more sensitive marker than factor VIII. Desmin and myoglobin were positive in 16 and 24 cases, respectively. Reactivity for cytokeratin was noted in ten cases, one of which showed glandular differentiation. Vimentin and S-100 positivity was obtained in 16 and 14 cases respectively. Thus, cardiac myxoma appears to arise from multipotent cells which have the potential to differentiate along several mesenchymal cells or epithelial cells and may also concurrently exhibit reactivity for both mesenchymal and epithelial markers.
