NCI Dictionary of Cancer Terms
The NCI Dictionary of Cancer Terms features 8,459 terms related to cancer and medicine.
We offer a widget that you can add to your website to let users look up cancer-related terms. Get NCI’s Dictionary of Cancer Terms Widget.
- primary tumor
- listen (PRY-mayr-ee TOO-mer)
- A term used to describe the original, or first, tumor in the body. Cancer cells from a primary tumor 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 tumor. Also called primary cancer.