cancer of unknown primary origin

cancer of unknown primary origin

A cancer identified in a particular tissue which is thought to be a metastasis from elsewhere, for which the primary cancer is not found after an extensive workup.

cancer of unknown primary origin

Oncology A cancer identified in one part of the body, although primary site cannot be found
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Patients may be diagnosed with cancer of unknown primary origin if the primary tumor is too small to be identified with routine imaging tests, it regresses (disappears) before a secondary tumor arises or the secondary tumor has several possible primary sites.
About Cancer of Unknown Primary Origin According to the American Cancer Society, an estimated 2 to 5 percent of all cancer patients have metastatic (secondary) tumors for which routine testing cannot locate the primary site.
Three to five percent of all cancer patients(1) (the equivalent of 45,000-75,000 new patients each year in the United States alone) receive a diagnosis of cancer of unknown primary origin, or CUP, meaning their cancer has spread to multiple locations and the site where the cancer started can not be determined.
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