NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,790 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.

LCIS
A condition in which abnormal cells are found in the lobules of the breast. This condition seldom becomes invasive cancer. However, having LCIS in one breast increases the risk of developing breast cancer in either breast. Also called lobular carcinoma in situ.

EnlargeLobular carcinoma in situ (LCIS); drawing shows a lobe, ducts, lobules, and fatty tissue in a cross section of the breast. Three separate pullouts show a normal lobe, a normal lobule, and a lobule with abnormal cells.

Lobular carcinoma in situ (LCIS). Abnormal cells are found in the lobules of the breast.