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NCCN Guidelines for Patients


Breast Cancer - Carcinoma in Situ

(stage 0)

, Version 1.2016


Carcinoma in situ

Understanding cancer

merge with blood or a clear fluid called lymph. Then,

the cancer cells travel in blood or lymph through

vessels to other sites. Once in other sites, secondary

tumors can grow and sometimes cause major health

problems. This is why it is important to find and treat

breast cancer before it becomes invasive and can


Figure 1.3 Normal cell growth vs. cancer cell growth

Normal cells increase in number when they are needed and die when old or damaged.

In contrast, cancer cells quickly make new cells and live longer because of abnormal

changes in genes.

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