ClinVar

Description

Variant summary: BRCA2 c.475+14C>T alters a non-conserved nucleotide located close to a canonical splice site and therefore could affect mRNA splicing, leading to a significantly altered protein sequence. 4/4 computational tools predict no significant impact on normal splicing. However, these predictions have yet to be confirmed by functional studies. The variant allele was found at a frequency of 3e-05 in 262798 control chromosomes. The available data on variant occurrences in the general population are insufficient to allow any conclusion about variant significance. c.475+14C>T has been reported in the literature in sequencing studies of individuals affected with Hereditary Breast and Ovarian Cancer (Barrios_2017) as well as the general population of Japanese individuals (Ahmadloo_2017, jMorp database, and HGVC-Kyoto database). These report(s) do not provide unequivocal conclusions about association of the variant with Hereditary Breast and Ovarian Cancer. To our knowledge, no experimental evidence demonstrating an impact on protein function has been reported. Three clinical diagnostic laboratories have submitted clinical-significance assessments for this variant to ClinVar after 2014 without evidence for independent evaluation. All laboratories classified the variant as likely benign. Based on the evidence outlined above, and no emerging evidence supporting a pathogenic outcome since its original classification at our laboratory, the variant was re-classified as likely benign.