Just wanted to add, DCIS, by definition, is NON invasive, so I don't believe it's possible to have "invasive" DCIS.
Since the in situ cells aren't in the appropriate phase of cell division that can be affected/interrupted by chemotherapies, surgery, radiation & hormonal tx's are the only options.
From Wikipedia:
Carcinoma in situ (
CIS) is an early form of
carcinoma defined by the
absence of invasion of surrounding tissues. In other words, the
neoplastic cells proliferate in their normal habitat, hence the name "in situ" (Latin for "in its place").
Threaded Mode