BRCA1 and ductal breast carcinoma in situ: In a recent study of MRI surveillance of healthy BRCA1 and BRCA2 carriers, Lubiński et al. detected 33 (1.9%) cases of DCIS and 205 (11.7%) cases of invasive breast cancer in 1756 women undergoing regular MRI surveillance, while among 732 women without MRI surveillance, DCIS was detected in 17 (2.3%) and invasive breast cancer in 79 (10.8%) cases [35].