NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,846 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

in situ
(in SY-too)
In its original place. For example, in carcinoma in situ, abnormal cells are found only in the place where they first formed. They have not spread.