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Hereditary breast and ovarian cancer: new genes in confined pathways
Finn Cilius Nielsen1, Thomas van Overeem Hansen1, Claus Storgaard Sørensen2
1Center for Genomic Medicine, Rigshospitalet, University of Copenhagen, 2100 Copenhagen, Denmark.
Abstract:
Genetic abnormalities in the DNA repair genes BRCA1 and BRCA2 predispose to hereditary breast and ovarian cancer (HBOC). However, only approximately 25% of cases of HBOC can be ascribed to BRCA1 and BRCA2 mutations. Recently, exome sequencing has uncovered substantial locus heterogeneity among affected families without BRCA1 or BRCA2 mutations. The new pathogenic variants are rare, posing challenges to estimation of risk attribution through patient cohorts. In this Review article, we examine HBOC genes, focusing on their role in genome maintenance, the possibilities for functional testing of putative causal variants and the clinical application of new HBOC genes in cancer risk management and treatment decision-making.
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