primary

Definition of primary cancer
National Cancer Institute

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.

Source: NCI Dictionary of Cancer Terms