NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,812 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.

nonmelanoma carcinoma in situ
(non-MEH-luh-NOH-muh KAR-sih-NOH-muh in SY-too)
Abnormal cells are found in the squamous cell or basal cell layer of the epidermis (topmost layer of the skin). These abnormal cells may become cancer and spread into nearby normal tissue. Also called stage 0 nonmelanoma skin carcinoma in situ.

EnlargeStage 0 nonmelanoma skin carcinoma in situ; drawing shows skin anatomy with abnormal cells in the epidermis (outer layer of the skin). Also shown are the dermis (inner layer of the skin) and subcutaneous tissue below the dermis.

Stage 0 nonmelanoma skin carcinoma in situ. Abnormal cells are shown in the epidermis (outer layer of the skin).