NCCN Guidelines for Patients
Breast Cancer - Carcinoma in Situ
, 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
• If not treated, breast cancer can spread
beyond the breast through lymph or blood and
cause major health problems.