NCCN Guidelines for Patients
Breast Cancer - Carcinoma in Situ
, Version 1.2016
Carcinoma in situ
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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