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6

NCCN Guidelines for Patients

®

Breast Cancer - Carcinoma in Situ

(stage 0)

, Version 1.2016

You’ve learned that you are at risk for

or have breast cancer. It’s common

to feel shocked and confused. Part 1

reviews some basics about carcinoma

in situ.

Women’s breasts

Before learning about carcinoma in situ, it is helpful

to know about breasts. The ring of darker skin seen

on the outside of the breast is called the areola. The

raised tip in the middle of the areola is called the

nipple. In young girls, there are small ducts under the

nipple that branch into fatty tissue like early growth

from a seedling. These immature ducts are supported

by connective tissue called stroma.

Increases in female hormones among girls during

puberty cause their breasts to change. The stroma

increases, the ducts grow and branch out like tree

limbs, and lobules form at the end of the ducts like

leaves at the end of twigs. Lobules are small sacs

that make breast milk after a baby is born. Breast milk

drains from the millions of leaf-like lobules into the

ducts that connect to the nipple.

See Figure 1.1

for a

look inside women’s breasts.

1

Carcinoma in situ

6 Women’s breasts

7 The 3 types

8 Understanding cancer

10 Review