NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,942 terms related to cancer and medicine.

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carcinoma in situ
(KAR-sih-NOH-muh in SY-too)
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.