Hi Natalie
i had DCIS also, a 4.5 cm area removed but no clear margins, er/pr +
i had no lymph involvement, and had a bilateral mastectomy.
if you have a mastectomy, radiation is not normally required and chemo is not normally required for DCIS.
you would need ongoing monitoring I.e regular mammogram on the other side. The confusing thing with DCIS i found was that there are so many types and they have variable characteristics.
if you are unsure get a copy of your pathology report which will identify all the elements of your DCIS and ask your Dr to explain it to you.
while you still have questions keep asking
hugs
chrisxx