NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,777 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.

lumpectomy
(lum-PEK-toh-mee)
Surgery to remove a tumor (lump) in a breast and a small amount of normal tissue around it. It is a type of breast-conserving surgery.

EnlargeBreast-conserving surgery; drawing shows removal of the tumor and axillary lymph nodes.

Breast-conserving surgery. Dotted lines show the area containing the tumor that is removed and some of the lymph nodes that may be removed.