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Title: Results of multigene panel testing in familial cancer cases without genetic cause demonstrated by single gene testing
Author: Dominguez-Valentin, Mev
Nakken, Sigve
Tubeuf, Hélène
Vodák, Daniel
Ekstrom, Per Olaf
Nissen, Anke M.
Morak, Monika
Holinski-Feder, Elke
Holth, Arild
Capellá, G. (Gabriel)
Davidson, Ben
Evans, D. Gareth
Martins, Alexandra
Moller, Pal
Hovig, Eivind
Keywords: Càncer
Malalties hereditàries
Genetic diseases
Issue Date: 6-Dec-2019
Publisher: Nature Publishing Group
Abstract: We have surveyed 191 prospectively sampled familial cancer patients with no previously detected pathogenic variant in the BRCA1/2, PTEN, TP53 or DNA mismatch repair genes. In all, 138 breast cancer (BC) cases, 34 colorectal cancer (CRC) and 19 multiple early-onset cancers were included. A panel of 44 cancer-predisposing genes identified 5% (9/191) pathogenic or likely pathogenic variants and 87 variants of uncertain significance (VUS). Pathogenic or likely pathogenic variants were identified mostly in familial BC individuals (7/9) and were located in 5 genes: ATM (3), BRCA2 (1), CHEK2 (1), MSH6 (1) and MUTYH (1), followed by multiple early-onset (2/9) individuals, affecting the CHEK2 and ATM genes. Eleven of the 87 VUS were tested, and 4/11 were found to have an impact on splicing by using a minigene splicing assay. We here report for the first time the splicing anomalies using this assay for the variants ATM c.3806A > G and BUB1 c.677C >T, whereas CHEK1 c.61G > A did not result in any detectable splicing anomaly. Our study confirms the presence of pathogenic or likely pathogenic variants in genes that are not routinely tested in the context of the above-mentioned clinical phenotypes. Interestingly, more than half of the pathogenic germline variants were found in the moderately penetrant ATM and CHEK2 genes, where only truncating variants from these genes are recommended to be reported in clinical genetic testing practice.
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It is part of: Scientific Reports, 2019-12-06, Vol. 9
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Appears in Collections:Articles publicats en revistes (Institut d'lnvestigació Biomèdica de Bellvitge (IDIBELL))

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