ClinVar

Description

The BRCA2 c.8350C>T variant is predicted to result in the amino acid substitution p.Arg2784Trp. This variant has been reported in an individual with triple-negative breast cancer (Table S4, Kraus et al. 2017. PubMed ID: 27616075), multiple families with a history of hereditary breast and/or ovarian cancer (HBOC) (van der Hout et al. 2006. PubMed ID: 16683254; Gómez García et al. 2009. PubMed ID: 19200354; Table S3, Casadei et al. 2019. PubMed ID: 31843900; Table S2, Shao et al. 2020. PubMed ID: 31742824), and in a non-smoking woman with lung adenocarcinoma (Donner et al. 2018. PubMed ID: 30032850). It has also been observed in an ovarian tumor (Additional file 4, Da Costa et al. 2019. PubMed ID: 31060523). Experimental studies have demonstrated that this variant reduces homology-directed DNA repair (HRD) (Table 2, Guidugli et al. 2013. PubMed ID: 23108138; Farrugia et al. 2008. PubMed ID: 18451181; Guidugli et al. 2018. PubMed ID: 29394989; Mesman et al. 2019. PubMed ID: 29988080). Recent studies have interpreted this variant as pathogenic based on HRD assay results (Hart et al. 2019. PubMed ID: 29884841). This variant has been reported in the gnomAD public population database in 2 of ~251,000 alleles and is interpreted as likely pathogenic by the vast majority of clinical laboratories in ClinVar (https://www.ncbi.nlm.nih.gov/clinvar/variation/38155/). In summary, this variant is interpreted as likely pathogenic.