Do you approach the treatment of post-lumpectomy DCIS which is only present within an intraductal papilloma differently, if it does not involve adjacent breast tissue?

From the medical oncology perspective, I would consider chemoprevention with endocrine therapy for this patient. Prior series have shown elevated relative risk in patients with papillomas with atypical cells (although not as high as DCIS itself). I am not sure about the size of the DCIS within the p...

I treat it like a low-risk disease and favor observation with no RT.