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[Electronmicroscopic study on tongue squamous cell carcinoma--radiotherapy cases]
N Tanaka1, K Shionoya, T Miyamoto
1First Department of Oral and Maxillofacial Surgery, Faculty of Dentistry, Tokyo Medical and Dental University.
Summary
Ultrastructural analysis of tongue squamous cell carcinomas revealed distinct cellular differences between metastatic and non-metastatic cases post-radiotherapy. Non-metastatic tumors showed more microvilli and weaker cell attachment, unlike metastatic ones.
Area of Science:
- Oncology
- Cell Biology
- Pathology
Background:
- Investigating the ultrastructural characteristics of tongue squamous cell carcinomas (SCC) is crucial for understanding metastatic potential.
- This study compares electron microscopic findings in metastatic versus non-metastatic tongue SCC following radiotherapy.
Observation:
- Non-metastatic tongue SCC (T1N0/T2N0, WHO Grade I/II) exhibited numerous microvilli and sparse desmosomes, indicating weak cell-cell adhesion.
- Metastatic tongue SCC, even with controlled primary lesions, displayed underdeveloped microvilli and abundant desmosomes.
- Cellular atypia and nuclear chromatin dispersion were evident in metastatic cases.
Findings:
- Radiotherapy influences the ultrastructure of tongue SCC, differentiating metastatic from non-metastatic presentations.
- Weak cell attachment and abundant microvilli characterize non-metastatic tongue SCC post-radiotherapy.
- Conversely, reduced microvilli, increased desmosomes, and cellular atypia are associated with metastasis in tongue SCC.
Implications:
- Ultrastructural features may serve as prognostic indicators for tongue SCC treated with radiotherapy.
- Understanding these cellular differences could inform targeted therapeutic strategies for advanced tongue SCC.
- Further research into cell adhesion mechanisms in tongue SCC could reveal novel therapeutic targets.