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The basement membranes in sarcomatoid carcinomas. An immunohistochemical study
M Guarino1, S Squillaci, D Reale
1Department of Anatomical Pathology, Hospital of Treviglio, Italy.
Tumori
|April 30, 1993
Summary
Basement membrane disruptions are common in sarcomatoid carcinomas. These changes suggest the sarcomatous part may arise from epithelial cells via epithelial-mesenchymal transition.
Area of Science:
- Oncology
- Pathology
- Cell Biology
Background:
- Sarcomatoid carcinomas exhibit both carcinomatous and sarcomatous components.
- The origin of the sarcomatous component in these tumors is not fully understood.
- Basement membranes play a crucial role in tissue structure and cell differentiation.
Purpose of the Study:
- To investigate basement membrane characteristics in sarcomatoid carcinomas.
- To analyze basement membranes at the interface between carcinomatous and sarcomatous tissues.
- To explore the potential epithelial origin of the sarcomatous component.
Main Methods:
- Immunohistochemical staining of laminin, type IV collagen, and heparan sulfate proteoglycan.
- Analysis of paraffin-embedded tissue sections from eight sarcomatoid carcinoma cases.
- Utilized the peroxidase-antiperoxidase technique for antibody staining.
Main Results:
- Observed interruptions and discontinuities in basement membrane staining in all cases.
- Identified larger defects or complete loss of basement membrane staining in 40% of cases.
- Noted blurred boundaries between carcinomatous and sarcomatous tissues at sites of basement membrane disruption.
Conclusions:
- Frequent disruption and loss of basement membranes occur at the interface of carcinomatous and sarcomatous tissues in sarcomatoid carcinomas.
- These findings support the hypothesis of an epithelial origin for the sarcomatous component.
- Suggests an epithelial-mesenchymal conversion mechanism may underlie sarcomatoid carcinoma development.