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Dcis
has always been considered precancer or Stage O because the cancer cells are there but completely contained in the duct or, lobe, as in LCIS. Where much of the research lies is in trying to understand what portion of these will go on to become cancer, or, how much these things increase a women's overall risk of developing a full blown bc.
I had both in 1997. LCIS was treated with clean margin lumpectomy. DCIS was treated with lumpectomy and radiation. At the time, tamoxifen or similar for er+ was not considered. Now it is.
I was diagnosed with Invasive Ductal Carcinoma in 2004. Both breasts, with positive lymph nodes in one side only. Obviously, I am the worst possible outcome for DCIS/LCIS as for me, they turned out to be early markers for an invasive cancer to come. But again, NOT ALWAYS THE CASE.
Read as much as you can about DCIS and get as many opinions as you can. There's still a lot of disagreement out there about it.
Susan Love's Breast Book is always a good place to start.
Best to you,
Ginagce
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