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Allelotype of papillary serous peritoneal carcinomas
I Cass1, R L Baldwin, E Fasylova
1Cedars-Sinai Medical Center, Los Angeles, California, 90048, USA. cassi@cshs.org
Gynecologic Oncology
|June 28, 2001
Summary
Papillary serous peritoneal carcinoma (PSPC) shows less allelic loss than papillary serous ovarian carcinoma (PSOC). Common chromosomal regions suggest shared tumor suppressor genes, potentially including p53, in both cancers.
Area of Science:
- Oncology
- Genetics
- Molecular Biology
Background:
- Papillary serous peritoneal carcinoma (PSPC) and papillary serous ovarian carcinoma (PSOC) are histologically similar but may have different origins.
- Understanding genetic differences is crucial for accurate diagnosis and treatment strategies.
Purpose of the Study:
- To compare the incidence of allelic loss (LOH) and p53 mutations via p53 overexpression between PSPC and PSOC.
- To identify common chromosomal regions potentially harboring key tumor suppressor genes.
Main Methods:
- Allelotype analysis using 39 microsatellite markers in 26 PSPC patients.
- Comparison with 37 previously studied PSOC patients.
- Detection of p53 mutations through immunohistochemical assessment of p53 overexpression.
Main Results:
- Significantly lower frequency and extent of LOH in PSPC compared to PSOC.
- LOH observed on 4 chromosome arms in PSPC versus 18 arms in PSOC (P < 0.001).
- P53 overexpression detected in 80% of PSPC tumors, with median LOH frequency higher in PSOC (43%) than PSPC (33%).
Conclusions:
- Allelic loss is less frequent in PSPC than PSOC.
- Shared chromosomal regions (12p, 17p, 17q, 18q) with high LOH frequencies suggest important tumor suppressor genes involved in the carcinogenesis of both PSPC and PSOC.
- These genes likely include p53, highlighting its potential role in both malignancies.