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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secondary cancer
(SEH-kun-dayr-ee KAN-ser)
A term that is used to describe cancer that has spread (metastasized) from the place where it first started to another part of the body. Secondary cancers are the same type of cancer as the original (primary) cancer. For example, cancer cells may spread from the breast (primary cancer) to form new tumors in the lung (secondary cancer). The cancer cells in the lung are breast cancer cells, not lung cancer. Also called secondary tumor.