NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,917 terms related to cancer and medicine.

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secondary tumor
(SEH-kun-dayr-ee TOO-mer)
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 tumors 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 tumor). The cancer cells in the lung are breast cancer cells, not lung cancer. Also called secondary cancer.