Carcinoma in situ. Definition

Medical Definition: Carcinoma in situ

Malignant tumor that has not broken the basal layer and, therefore, has not spread. Group of abnormal cells that remain in the same place in which they formed. No spread. These abnormal cells may become cancer and spread into the surrounding tissues healthy. Also called stage 0 disease. The concept is of particular interest because it is considered that in situ cancers are likely to be cured by simple removal of a tumor. The purpose of testing for early diagnosis of cancer is determining the highest number of cancers in this phase. Also known as pre-invasive carcinoma and intraepithelial carcinoma.

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