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E-cadherin expression in thymomas
1Department of Pathology, Yonsei University College of Medicine, Seoul, Korea.
Insights
E-cadherin (E-CD) expression is linked to epithelioid cell morphology in thymomas. This suggests E-CD acts as a morpho-regulatory factor, not an invasion suppressor, in these tumors.
Area of Science:
- Oncology
- Cell Biology
- Immunohistochemistry
Background:
- Thymomas are neoplasms of the thymus gland with diverse histological subtypes.
- E-cadherin (E-CD) is a cell adhesion molecule crucial for tissue integrity.
- The role of E-CD in thymoma pathogenesis and behavior requires further elucidation.
Purpose of the Study:
- To investigate the expression patterns of E-cadherin in various thymoma subtypes.
- To correlate E-CD expression with histological features and tumor behavior.
Main Methods:
- Immunohistochemistry using monoclonal antibody HECD-1 on 72 thymoma tissue sections.
- Microwave-enhanced technique on formalin-fixed, paraffin-embedded samples.
- Classification of thymomas according to the modified Müller-Hermelink system.
Main Results:
- E-cadherin (E-CD) was expressed in cohesive epithelioid tumor cells of well-differentiated thymic carcinomas (WDTC).
- Cortical type thymomas showed stronger E-CD expression than organoid types.
- No loss of E-CD expression was observed in invasive foci of high-staged WDTC.
Conclusions:
- E-cadherin expression strongly correlates with epithelioid morphology in thymomas.
- E-cadherin appears to function as a morpho-regulatory factor rather than an invasion suppressor in organotypic thymomas.
Abstract:
For the purpose of investigating the pattern of E-cadherin (E-CD) expression in thymomas, 72 cases were immunostained using monoclonal antibody (HECD-1) and microwave-enhanced immunohistochemical method on formalin-fixed, paraffin-embedded tissue sections. The thymomas were classified according to modified Müller-Hermelink classification. The spindle-shaped, medullary type tumor epithelial cells in medullary (3 cases) and composite type (20 cases) thymomas rarely expressed E-CD except in focal areas showing microcystic change observed in 8 cases. Meanwhile, the cohesive epithelioid tumor cells in every case of well-differentiated thymic carcinomas (WDTC) (29 cases) expressed E-CD. The epithelial cells in cortical type (13 cases) expressed stronger E-CD compared with those of organoid type (7 cases). In cases of WDTC admixed with cortical type, we observed increasing expression of E-CD as the tumor epithelium forms cohesive sheets. We could not find any loss of E-CD expression in invasive foci of the 11 cases of high-staged WDTC examined. Since the results of our study show a strong correlation between E-CD expression and epithelioid morphology of the tumor, E-CD seems to play a major role as a morpho-regulatory factor rather than as a suppressor of invasion in organotypic thymomas.