carcinoma in situ

Definition / meaning of carcinoma in situ

A group of abnormal cells that remain in the place where they first formed. They have not spread. These abnormal cells may become cancer and spread into nearby normal tissue. Also called stage 0 disease.

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Find More About 'carcinoma in situ'

Source(s):

The Web site of the National Cancer Institute (http://www.cancer.gov/)

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