BRCA1 and breast cancer: Moreover, we successfully identified the molecular breakpoints in five out of the eight CNV-positive samples by applying long-range PCR followed by Sanger sequencing, among which deletions of BRCA1 exons 1-2 including g.61,242_98,355del and g.61,101_98,034del have been identified as recurrent CNVs in Chinese patients with breast cancer (Su et al., 2018).