Yang et al. reported that pure DCIS was diagnosed in 15/71 BRCA1 patients (21.1%) undergoing surgery for BC and 10/43 BRCA2 patients (23.3%), in addition to DCIS associated with IDC diagnosed in both carrier groups (45/71—63.4% and 26/43—60.5%, respectively) [22]. The gene discussed is BRCA1; the disease is ductal breast carcinoma in situ.