Gene-panel testing of breast and ovarian cancer patients identifies a recurrent RAD51C duplication.

Gene-panel testing of breast and ovarian cancer patients identifies a recurrent RAD51C duplication. Clin Genet. 2017 Aug 12;: Authors: Pelttari LM, Shimelis H, Toiminen H, Kvist A, Törngren T, Borg Å, Blomqvist C, Bützow R, Couch F, Aittomäki K, Nevanlinna H Abstract Gene-panel sequencing allows comprehensive analysis of multiple genes simultaneously and is now routinely used in clinical mutation testing of high-risk breast and ovarian cancer patients. However, only BRCA1 and BRCA2 are often analyzed also for large genomic changes. Here, we have analyzed 10 clinically relevant susceptibility genes in 95 breast or ovarian cancer patients with gene-panel sequencing including also CNV analysis for genomic changes. We identified 12 different pathogenic BRCA1, BRCA2, TP53, PTEN, CHEK2, or RAD51C mutations in 18/95 patients (19%). BRCA1/2 mutations were observed in 8 patients (8.4%) and CHEK2 protein-truncating mutations in 7 patients (7.4%). In addition, we identified a novel duplication encompassing most of the RAD51C gene. We further genotyped the duplication in breast or ovarian cancer families (n = 1149), in unselected breast (n = 1729) and ovarian cancer cohorts (n = 553), and in population controls (n = 1273). Seven additional duplication carries were observed among cases but none among controls. The duplication associated with ovarian cancer risk (3/590 of all ovarian cancer patients, 0.5%, p=0.032 compared to c...
Source: Clinical Genetics - Category: Genetics & Stem Cells Authors: Tags: Clin Genet Source Type: research