NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 8,032 terms related to cancer and medicine.

primary cancer
(PRY-mayr-ee KAN-ser)
A term used to describe the original, or first, tumor in the body. Cancer cells from a primary cancer may spread to other parts of the body and form new, or secondary, tumors. This is called metastasis. These secondary tumors are the same type of cancer as the primary cancer. Also called primary tumor.