BRCA1 and ductal breast carcinoma in situ: A case-control study revealed the association of both BRCA2 (OR = 11.3, 95%CI 3.9 to 32.6, p < 0.0001) and BRCA1 (OR = 3.27, 95%CI 1.36 to 7.87, p = 0.01) with DCIS.