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Chromosomal aberrations in premalignant and malignant squamous epithelium
J Brieger1, R Jacob, H S Riazimand
1Department of Otorhinolaryngology, Laboratory of Molecular Tumor Biology, University Hospital of Mainz, Mainz, Germany. brieger@mail.uni-mainz.de
Cancer Genetics and Cytogenetics
|July 10, 2003
Summary
Genomic gains on 15q and 21q appear to be early events in oropharyngeal squamous cell carcinoma development. Later stages involve additional chromosomal gains and losses, potentially explaining multiple tumor formation.
Area of Science:
- Oncology
- Genetics
- Cancer Research
Background:
- Oropharyngeal cancer is a significant health concern.
- Understanding early genetic changes is crucial for tumor development and treatment strategies.
Purpose of the Study:
- To identify early chromosomal alterations in oropharyngeal cancer.
- To investigate the mechanisms behind multiple tumor development.
Main Methods:
- Comparative genomic hybridization (CGH) was used to analyze chromosomal imbalances.
- 22 primary oropharyngeal tumors and surrounding morphologically normal mucosa (M1 and M2) were examined.
Main Results:
- Prominent imbalances in primary tumors included gains on 3q, 15q, 8q, 11q and losses on 9p, 3p, 11q.
- Early changes in morphologically normal mucosa (M1) showed frequent amplifications on 15q and 21q.
- Chromosomal alterations decreased with distance from the primary tumor, correlating with reduced dysplasia.
Conclusions:
- Gains on 15q and 21q are suggested as early events in squamous cell carcinoma progression.
- Later-stage changes involve gains on 3q, 8q, 11q and losses on 3p, 9p.
- Cytogenetic data support a monoclonal origin with lateral spread for multiple head and neck squamous cell carcinomas.