We tested 564 women with DCIS for six Polish BRCA1 founder mutations (c.181T>G, c.4035del, c.5266dup, c.3700_3704del, c.68_69del and c.5251C>T) and for four Polish recurrent mutations of BRCA2 (c.658_659del, c.3847_3848del, c.5946del and c.7913_7917del). Here, BRCA1 is linked to ductal breast carcinoma in situ.