Carcinoma of Unknown Primary Directory

People with carcinoma of unknown primary (CUP) have metastatic cancer (cancer that started somewhere else in the body and spread to another area), but the place from where the cancer started is unknown. This occurs in about 2%-4% of cancer patients. Typically, CUP often starts in the lungs or pancreas. Less often, it may start in the colon, rectum, breast, or prostate. The prognosis for people with CUP is not as favorable as other types of cancer. Follow the links below to find WebMD's comprehensive coverage about carcinoma of unknown primary, what it looks like, how to treat it, and much more.