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Multiple genetic lesions in laryngeal squamous cell carcinomas
N S Fracchiolla1, L Pignataro, P Capaccio
1Laboratorio di Ematologia Sperimentale e Genetica Molecolare, Universita di Milano, Ospedale, Maggiore, Milan, Italy.
Cancer
|March 15, 1995
Summary
Alterations in protooncogenes and the p53 tumor suppressor gene are common in laryngeal squamous cell carcinoma (LSCC). These genetic changes, including mutations and amplifications, are linked to tumor progression and distinct molecular pathways in LSCC development.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Laryngeal squamous cell carcinoma (LSCC) is a significant health concern.
- Understanding the molecular mechanisms driving LSCC is crucial for effective treatment strategies.
Purpose of the Study:
- To investigate the role of protooncogenes (bcl-1, int-2, c-erbB-1, c-myc, ras) and the p53 tumor suppressor gene in LSCC pathogenesis.
- To identify genetic alterations in patients with LSCC at clinical presentation and relapse.
Main Methods:
- Utilized polymerase chain reaction (PCR), single-strand conformation polymorphism, and direct sequencing to analyze p53 and ras gene mutations.
- Employed Southern blot analysis to examine protooncogene loci (bcl-1, int-2, c-erbB-1, c-myc).
Main Results:
- p53 gene mutations were found in approximately 28% of LSCC patients.
- Amplification of bcl-1, c-erbB-1, and c-myc loci occurred in 26%, 13%, and 6% of cases, respectively.
- Multiple genetic lesions were observed in four patients, with bcl-1 amplification correlating with lymph node metastasis.
Conclusions:
- Alterations in protooncogenes and p53 are implicated in a significant proportion (approximately 60%) of LSCCs.
- The findings suggest diverse molecular pathways contribute to LSCC development.
- Specific genetic lesions may be associated with tumor behavior and metastatic potential.