Rates of Jewish ancestral mutations in BRCA1 and BRCA2 in borderline ovarian tumors

Journal of the National Cancer Institute
Walter H GotliebGilad Ben-Baruch

Abstract

Germline mutations in the BRCA1 and BRCA2 genes are known to be associated with an increased risk of breast and epithelial ovarian cancers. Two specific mutations, 185delAG-BRCA1 and 6174delT-BRCA2, have been detected in a substantial proportion (20%-60%) of unselected Ashkenazi Jewish patients--i.e., Jewish patients of Eastern/Northern European descent--with invasive ovarian cancer and in a measurable proportion (2%) of the general Ashkenazi Jewish population. However, uncertainty exists concerning the heritable basis of borderline ovarian tumors and whether these tumors represent an early form of ultimately invasive disease. To gain insight into these issues, we determined the rates of 185delAG-BRCA1 and 6174delT-BRCA2 mutations in patients with borderline ovarian tumors. Analysis of 185delAG-BRCA1 and 6174delT-BRCA2 germline mutations was performed by use of a heteroduplex formation assay in samples from 46 consecutive patients with borderline ovarian tumors and 59 consecutive patients with invasive epithelial ovarian cancers. Forty-eight samples were also analyzed by restriction enzyme analysis for the presence of the 5382insC-BRCA1 mutation, a mutation detected in 2.2% of Ashkenazi Jewish patients with breast, but not ovar...Continue Reading

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