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. As noted above, a primary cancer refers to the initial cancer a person experiences, whether that is lung cancer, breast cancer, or another type of cancer. It’s possible to have more than one primary cancer; sometimes these primary cancers are found at the same time, and sometimes they occur decades apart. This isn’t surprising, as some of the risk factors for cancer, such as smoking, raise the risk of several types of cancer. There are also a number of hereditary cancer syndromes that increase the risk of cancer in more than one organ or tissue type.
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Journal of Cancer Biology and Clinical Oncology 