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Monophasic and biphasic synovial sarcoma. An immunohistochemical study
Acta Pathologica Japonica
|April 1, 1987
Summary
Immunohistochemical analysis of synovial sarcoma (SS) reveals that monophasic and biphasic subtypes express similar cellular components. This suggests they are variations of the same disease, aiding in diagnosing difficult cases.
Area of Science:
- Oncology
- Pathology
- Immunohistochemistry
Background:
- Synovial sarcoma (SS) is a soft tissue sarcoma with diverse histological presentations.
- Distinguishing between monophasic and biphasic SS is crucial for diagnosis and treatment.
- Immunohistochemistry aids in characterizing cellular components of tumors.
Purpose of the Study:
- To investigate the immunohistochemical profiles of monophasic and biphasic synovial sarcoma.
- To determine if different histological patterns represent variations of the same disease.
- To assess the utility of immunohistochemistry in identifying specific cell types in SS.
Main Methods:
- Seven synovial sarcoma cases (5 monophasic, 2 biphasic) were analyzed.
- Monoclonal antibodies against intermediate filaments, keratin, and vimentin were used.
- Immunohistochemical staining patterns of slender spindle cells, plump cells, and epithelioid cells were evaluated.
Main Results:
- Slender spindle cells stained positive for vimentin and negative for keratin.
- Plump cells and epithelioid cells stained positive for both keratin and vimentin.
- Epithelioid cells were exclusively found in biphasic SS, while plump and spindle cells were present in all cases.
- Cellular staining patterns were consistent across monophasic and biphasic SS.
Conclusions:
- Monophasic and biphasic synovial sarcoma likely represent different expressions of the same disease.
- Immunohistochemistry is valuable for identifying plump cells, which are challenging to detect with routine staining.
- These findings refine the understanding of synovial sarcoma heterogeneity and diagnostic approaches.