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NCCN Guidelines for Patients


Breast Cancer - Carcinoma in Situ

(stage 0)

, Version 1.2016


Carcinoma in situ



• Inside of women’s breasts are lobules, ducts,

and stroma. Lobules are structures that make

breast milk. Ducts carry breast milk from the

lobules to the nipple. Stroma is a soft tissue

that surrounds the lobules and ducts.

• Not all carcinoma in situ is cancer. LCIS is

abnormal cell growth within breast lobules.

DCIS is cancer that hasn’t spread outside the

breast ducts.

• If not treated, breast cancer can spread

beyond the breast through lymph or blood and

cause major health problems.