For women with DCIS who have had a mastectomy, no further treatment is typically needed.

“for women who have had a lumpectomy um then there are a couple of options that they can think about one is to um do radiation therapy so one of the interesting things about dcis as we noted earlier is the cells tend to creep along the ductal channels and these all sort of arborize out um throughout the breast space and the cells can kind of sneak around in there so radiation therapy has been shown in many many studies to lower the risk of in breast recurrence including both more dcis and including the development of invasive breast cancer”