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Determination of cellular oncogene rearrangement or amplification in ovarian adenocarcinomas
D M Smith1, D E Groff, R K Pokul
1Division of Gynecologic Oncology, Georgetown University Medical Center.
Abstract:
Four cellular oncogenes, fos, myc, Ha-ras, and Ki-ras, are routinely expressed in ovarian adenocarcinomas. To determine whether the molecular lesion in ovarian carcinoma was a genetic rearrangement or amplification of expressed oncogenes, we examined the myc, Ha-ras, Ki-ras, and fos oncogenes in 14 serous adenocarcinomas of the ovary using molecular hybridization techniques. Using a series of diagnostic restriction endonucleases and gene-specific deoxyribonucleic acid probes, we found no evidence of rearrangement of these genes. In addition, we found no evidence of amplification of the cellular oncogenes analyzed in this series of ovarian tumors. Therefore genetic rearrangement or amplification of these cellular oncogenes is not the primary molecular lesion leading to their expression in ovarian carcinomas.
Insights
Ovarian adenocarcinomas commonly express cellular oncogenes like fos and myc. This study found no genetic rearrangement or amplification of these oncogenes in ovarian tumors, suggesting other mechanisms drive their expression.
Area of Science:
- Oncology
- Molecular Biology
- Genetics
Background:
- Ovarian adenocarcinomas frequently exhibit expression of cellular oncogenes, including fos, myc, Ha-ras, and Ki-ras.
- The underlying molecular basis for this oncogene expression in ovarian cancer remains incompletely understood.
Purpose of the Study:
- To investigate whether genetic rearrangement or amplification of specific cellular oncogenes (myc, Ha-ras, Ki-ras, fos) is responsible for their expression in ovarian adenocarcinomas.
Main Methods:
- Analysis of 14 serous ovarian adenocarcinomas using molecular hybridization techniques.
- Employing diagnostic restriction endonucleases and gene-specific DNA probes to assess oncogene integrity.
Main Results:
- No evidence of genetic rearrangement was detected in the myc, Ha-ras, Ki-ras, or fos oncogenes.
- No amplification of these cellular oncogenes was observed in the analyzed ovarian tumor samples.
Conclusions:
- Genetic rearrangement or amplification of the studied cellular oncogenes (fos, myc, Ha-ras, Ki-ras) is not the primary molecular event leading to their expression in ovarian carcinomas.
- Alternative molecular mechanisms likely account for oncogene expression in this cancer type.