Abstract:
BACKGROUND:Molecular genetic studies of ovarian cancer have been limited by the inaccessible location of the ovary, the advanced stage of tumors available for analysis, and the lack of a well-defined precursor lesion. However, genetic alterations important in ovarian tumorigenesis have been identified recently. METHODS:Molecular genetic evaluation of ovarian cancer primarily has utilized mutation analysis, immunohistochemical techniques, and loss of heterozygosity (LOH) studies. RESULTS:Overexpression of the HER-2/neu oncogene is present in approximately one third of ovarian cancers and is associated with poor prognosis. Mutations of the K-ras oncogene have been identified in a similar proportion of mucinous ovarian tumors, including borderline tumors. The study authors as well as others have frequently detected LOH on chromosome 17, including the p53 and BRCA1 loci, and at 17p3.3 and 1717q22-23. Genetic linkage analysis indicates that the majority of inherited ovarian cancers are caused by mutations in the BRCA1 gene. Mutations in mismatch repair genes have been identified in ovarian cancers that occur as part of the hereditary nonpolyposis colon cancer syndrome. CONCLUSIONS:Sporadic ovarian tumors are the end result of a complex pathway involving multiple oncogenes and tumor suppressor genes, including HER-2/neu, K-ras, p53, BRCA1, and additional tumor suppressor genes on chromosome 17. The majority of inherited ovarian cancers are due to mutations in the BRCA1 gene, which appears to be a tumor suppressor gene. It is hoped that an increased understanding of the molecular basis of ovarian cancer will lead to advances in prevention, diagnosis, and treatment.
journal_name
Cancerjournal_title
Cancerauthors
Gallion HH,Pieretti M,DePriest PD,van Nagell JR Jrdoi
10.1002/1097-0142(19951115)76:10+<1992::aid-cncr28subject
Has Abstractpub_date
1995-11-15 00:00:00pages
1992-7issue
10 Suppleissn
0008-543Xissn
1097-0142journal_volume
76pub_type
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